For trading, I believe most people have the right idea about using that Auction House system, but one could even take it one step further and use it across realms if indeed the new Battle.net has the original realms, USEast, USWest, etc. The across realm idea would open up trade to many more items to many more players.
The Auction House could also use Gold as the main currency, much like World of Warcraft. If gold isn't intended to be the main currency, then it could use whatever that currency is. Also, if a player is looking for an item instead of whatever the currency is, then there could be an option that lets the player put what item he is willing to sell that item for. For example:
For sale - Gladiator Breastplate of the Undead. Will sell for 200g or for Bonesaw of the Purple Penguin.
Now the player could choose to either give 200g or the Bonesaw of the Purple Penguin for that item.
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Well, I could even talk seriously and personally about sex without saying something akin to, "My girlfriend and I have had sexual intercourse not once, not twice, but thrice. During these times I had inserted my penis in and out of her vagina and ejaculated accordingly. I gently sobbed afterwards while she held me in her arms. This has all brought us closer together."
It has been said numerous times that being hostiled is usually a frustrating thing when you are not in a dueling game and that Blizz wants to make the game very co-operative and has not commented if PvP will be in DIII. A large majority of people who play DII recieve pleausre only from dueling, as they have done almost everything there is to do in the game and are now tuning thier dueler (I speak for myself aswell when I say this).
In DII, when creating a game, there are option like the difference in level and the maximum amount of players able to join the game. Why not make a PvP option, where the host may choose whether player hostility will be allowed in the game. I believe that this will satisfy both parties, those who wish to duel will be able to and those who wish to beat the game will also be able to so in peace.
I think this is a rather simple concept that may work well.
A vibrant and living economy would bring so much to the table for Diablo III. Often in Diablo II, people would create "Trading Games" where players would barter their gear. I envision a similar idea for Diablo III, but expanded.
Gold would be the currency in the game. Even though Diablo II's economy may seem item-item based at first glance, it has always quickly devolved into a currency driven system. Be it Stones of Jordan, PGems or High Runes, people just naturally tend toward a currency economy. In my opinion, a item-for-item only economy tends to scare players away from participating. An auction system where players could immediately see the value of Item X in the economy would be great.. more on this in a bit, on to the ideas!
Caldeum: A new type of "trading" game available as an option upon creation. Instead of creating a normal game to adventure through the storyline, you would have the option of creating a "trade" game. The environment for this "world" would be Caldeum, for example. A large city driven by trade. All abilities would be disabled in this game, so theoretically the game could hold a large number of players. Players would trade/sell/buy items and have access to...
Trade Posts: Within the "Caldeum trade game" as outlined above, there would be Trade Posts. The trade post would be global for the server shard. ie... everyone on the US server shard would have access to the same Trade Post. Players could post items for trade/sale here. Sellers could place a starting bid, as well as a buyout price (or perhaps just a static price). Also, a player could post notes on an item detailing an item the seller is looking for in exchange. Perhaps a way to post either price in gold, or a certain item (not sure how this would be implimented without having access to an in-game list of all items).
Now, on to...
PvP
PvP combat is a large part of the Diablo experience for a lot of players. I think Diablo III has a lot of PvP potential. My ideas are as follows...
Ranking system: Players should gain PvP rank for slaughtering other players in combat. The higher ranked your enemy is, the more potential gain you have if you win the battle. There would be no tangible rewards other than climbing a visible ladder system and possibly titles? (similar to the titles you gained after completing each difficulty level in Diablo II). Players would battle eachother in...
Death Valley: Players need a more organized way to PvP. Similar to my "Trade Game" idea above, a separate game type for PvP would be ideal, in my opinion. There could be multiple environments avialable to the game creator. Players would have a small "safe zone" to repair, get to the stash, etc.. They would enter a portal to leave town that would place them randomly in the free-for-all PvP environment outside. The only way back to town is to die =) You could have games for barbarian vs. barbarian, two vs. two, three vs. three, etc.. etc.. etc.. There is a lot of potential here, but I'm not sure where to draw the line.
That's it! I probably left a lot out, but ah well! Thanks for reading if you made it this far.
Suggestion for trading:
---I would like to see the game keep the original Diablo and Diablo 2 system of non bindable items. It keeps a flow of items around, and those that quit the game can give lucky players there items.
---Unique traded items should be sparkly on the border and have the name of the item clearly visible without hovering over it. This prevents users from switching the item before the trade is completed and scamming the end user.
---Dropping an item will not become visible to everyone else for atleast 10 seconds. This prevents you from accidently dropping an item, and another user snatching it up before you can grab it back.
Town suggestion:
---I would like to see the ability to use skills like Teleport or Leap, if Teleport is in the game that is, be usable in town. Skills that are harmless should be town accessible.
When it comes to the aspect of trading. One of the things in DiabloII that bothered me was having to constantly open trade with many different people in order to get an idea of what that person has to trade.
In terms of trading my suggestion is simple. Allow all players to engage in a trade window. Example, 4 players are in a room playing, and they want to do some trading. instead of having to jump between players and making offers, they instead would just open one big trade window. allowing players to talk amongst themselves about doing trades. features would include the ability to designate trades to certain players. so you could have two players do a trade not affecting other players in the window. It could also set up the ability to do three-way trades(which was one thing I hated doing in Diablo2 because people always lost items) it would generally make trading easier. This design would work best in a group of 4, and I only suggest it because it seems the idea is to only have a max of 4 players in a room at once. However, it can be tinkered with to allow 8 players you could make all the windows a little smaller to allow 8 inventories to show up. That's the other thing that makes this system great. you get a small trade window and a full view of another persons items. So you can browse their items at leisure instead of constantly having to drag and drop items into an inventory block.
This idea would make trading much easier to deal with and would allow players to avoid the headaches of trying to trade with multiple people at once that was present in diabloII.
Incorporating the ability to resocket an item, with runes or gems, in case of a miss-step. Or just the desire to replace the runeword you used with the latest one you learned. Unsocketing, of course destroys the rune or gem removed, but not all of them. Letting you over-ride a socket bonus in a given item without wasting the item.
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DoubleTalk Isn't.
There are no perfect characters, only progress towards...
Customization would be my biggest wish. Not only choosing my class and gender, but being able to modify body size, weight, color to a certain degree that we have not seen in previous iterations of the game. It is definitely the one area Blizzard has lacked in all of their previous games; at end-game level everyone really does look like everyone else. I live in Suburbia and as cost-effective as it is, I don't want the same thing for the games I play. Thanks
I hope the player based economy is expanded and more balanced than in D2. Either by making gold more valuable or adding additional forms of currency as well as additional money sinks. I really enjoyed D2 for a long time online till the economy got really crazy.
pvp: i would like pvp to be similar to diablo 2, i liked the fact that you could host someone else without their consent... the consent is very unrealistic and very un-diabloesque, if you have to agree to hostiling it takes away some of the games suspense.
economy: i think that the economy should be very item driven instead of gold driven... items allow a unique trading/barter system unlike any other game out there and yet again... keeps the diablo-ness of the game... and unique items taht are... welll... unique
In my opinion Blizzard should maintain the individual barter system that Diablo has always had, keeping the exchange of items personal (via trading from player to player, rather than player to auction house to player).
While keeping that in mind though, the process for which advertisement and communication should be streamlined. A system should be in place for users to find other users selling items they want. This could be in a format somewhat like an auction house, but without the ability to bid or buy items. This way somebody could easily locate and talk to a seller in the community. This could also be used in reverse, so in case nobody is selling the item somebody wants, they can post an advertisement seeking it. Should anybody want to sell it, they can scan for those who want it. Next to the advertisement can be an area where the advertiser types in what they are seeking or offering (or they can leave it blank).
Along with that the need for a mail system should be addressed. Or at the very least a "sent when user is online" feature, so the buyer could inform the seller they are interested, or vise versa. They could then set up a time and place to meet and exchange.
Example: Player A is currently looking for Overpowered Sword. He does a scan for Overpowered Sword and finds Player B selling it. To the right of it Player B has listed some things he is interested in. Mediocre Shield, Sub-par Traveling Boots, Expensive Sunglasses, or any of the two Fake Diamond Rings. Player A, having the shield and boots can then message Player B to offer them and set up a place to exchange.
One more idea, which I think would make our lives a lot easier, is the ability to exchange items OUTSIDE of a game. Via whatever the interface is outside of individual games (currently it is a chatroom). If some system was set up to trade say, items in the stash with other players, the annoyance of setting up games might be removed. In the above example, say Player A and Player B are rarely on during the same hours due to their schedule. Player A could send a mail containing the boots and the shield in it, and in order to take them Player B would have to put the sword in and send it.
By putting a time limit on these trades (a few days or so), it would be a much simplified way to exchange and avoid many of the hassles of finding trades today.
Alright, here is a list I made of random things I would like to see in Diablo 3:
Inventory - Although I am glad to see the grid system go I hope the developers are not planning on making the diablo inventory system similar to the one in WoW. I think I'd like to see a system where you have certain "boxes" on your inventory screen which can only hold specific items. Maybe 5 boxes which can only hold weapons, 5 boxes which can hold only armor... something like that.
Armor dying - With loot being the basis of a Diablo game I think this would be a cool and fun addition.
PVP - I wouldn't mind if pvp was completley removed from Diablo 3. I find that PVP primarily adds frusteration and takes away from the immersion and epicness of a gane which is entirely PVE based. I'm sure pvp could be implemented in a way thats suits the needs of everybody but I'd rather the developers spend all their effort working on great PVE.
End Game - Instead of requiring players to farm the same bosses over and over (Baal) in hopes of drops I think it would be interesting to add randomness to the endgame of Diablo 3. How about a dungeon where players summon a random looking boss with random abilities? This would keep the endgame refreshing and require players to continually become more skillful as they are required to adapt to different variations of this boss.
Economy - The economy in Diablo 2 was horrible. Gold was useless and duped items were everywhere. Hopefully there are plans to ensure the economy in Diablo 3 will be better.
Things in Diablo 2 which Diablo 3 shouldn't change:
- Waypoint system
- The wide variety of loot
- Unique classes and cool abilities
- A variety of monsters
- Story driven quests
- Difficulty curve
- Different and unique environments
Finally, I'd just like to say that I'm really happy with the way Diablo 3 is currently looking. I think the health globe system is genius, and I'm a fan of the art design. Keep up the good work!
Ok, duelling was fun and all in DII but clearly there was 1 major problem.. In diablo 2 you had to be over lvl 9 to be able to hostile someone.. So the problem was that even a lvl 80 was able to hostile a lvl 10.. To me this makes no sense, this cant be fun at all for the lvl 10 because he doesnt even have any good skills to defend him self. There was no lvl restriction.
Thats not the solution that i thought up of.. I honestly think people would really dislike a lvl restriction.
So basically the best option is this..
Lets pretend in diablo there are 5 acts. and the lvl cap is 1 - 99. To solve the huge gap of lvls in duelling is to have a lvl restriction in EACH ACT..
So in act 1, ONLY lvl 9 - 21 are only able to fight.. So players that reach act 2 are usually gunna be stronger, so in Act 2 lvls between 22 - 31 are only able to fight...and so on... So in act 5, only lvl 80 - 99 are able to fight, because a lvl 80 has a better chance of surviving than a lvl 10... against a lvl 99 player..
This will solve the huge lvl character gap that D2 lacked.
i really hope this idea is liked by many ppl becuz i know what i am talkin about and tryin to fix was a huge problem in D2.
I honestly think this is the best thing to improve on , and i deserve to get the beta key because up to this day i still havent played WoW...and im not lying...
Because blizzard has yet to release a lot of the details about battle.net 2.0 and its capabilities I'm not going to go crazy about this stuff.
First off PvP: I never saw D2 as a big PvP type game, yea duels were fun every now and then but with the way the diablo series plays, Blizzard would be hard pressed to provide a level of PvP like that of WoW. I could see no feasable way they could fit traditional PvP(groups vs groups) or WoWish PvP(battle grounds with objectives) in a "Hack n Slash" game such as diablo, I mean "OMFG NOOB LEARN TO GET THE FLAG" just doesn't sound like something from diablo now does it? An option in keeping with Diablo's "Hack n Slash" style and still incorporating PvP would be just an "open world" so to speak. As in a game hosted by blizzard(with no character limits), that anyone can join, that allows player to just run around and kill each other with no over all objective. But personally I think they should just implement a dueling system similar to WoWs, in which both players have to agree to the duel and neither die or loses items. This would solve the problem we have all had with people joining games and going hostile with everyone and laughing as everyone quits the game.
Secondly the trading system: Make gold the standard form of currency. I REPEAT, MAKE GOLD THE STANDARD FORM OF CURRENCY. We all know how horrible trading was in d2, and how it it took hours to get anything you wanted, so I wont go into all that. A gold system in diablo would still be as flawed as d2's system unless there was some way to easily sell your items for gold. I can only see two ways blizzard could make selling easier one is a horrible idea(IMO) and the second totally depends on what battle.net 2 can do. The first is basically what Knight online does, you set up a little table with all your crap on it and a bubble over your head saying what you are selling. They could do this with just a large open area server with no limit on the amount of people in the game, aka a horrible idea(but totally doable). The 2nd part totally depends on if battle.net has a mail system, if it does you could totally do a normal auction house. If you can picture the diablo2 battle.net chat channel and games tab(which im sure you can;)), they could have a similar setup in d3 but with an auction house tab in the lobby, that is very similar to WoWs auction house where you throw up the item with a set buy out price. This would allow players to just throw up the item and go join a game or get off. With how blizzard is doing the battle.net 2.0 servers, this auction house will be for the entire server (aka the US/Europe server etc).
The only problem I see with this auction house like this, is the entire server will be using one AH, and that's A LOT of people(think well over 250,000 people)! So unless blizzard comes out with some sort of sub-server to each realm, I don't see the auction house style of trade system working without being a huge load on blizzard's servers. But the old style of trading like in d2 would be just as bad if not worse. So blizzard has their hands quite full in the trading department.
As your character progresses through Sanctuary, they should gradually change (for better or worse) psychologically, as well as physically. If a character talks to a lot of townsfolk, they should be more sociable and cheery, whilst the player who avoids townsfolk may only reply to villagers with grunts or laughs.
Likewise, if a player incurs lots of damage, they should receive scars and the like. If they're poisoned or cursed, there should be a physical indication.
For trading, I would like some sort of Auction House implemented to simplify trading. However, I do not want it done the same way WoW does it. Instead, it should check other auctions for the same item you are putting up and give you a reasonable price compared to other sellers. It should also keep a history stored in the servers so that it can also tell you how high the item's price has peaked, how low it has gotten, and where it is now (in terms of price) compared to where it was at other times. Also, unlike WoW, there should be somewhat serious repercussions for removing an item from the Auction House. Also, gold should have more worth in Diablo 3. It should be a valid currency, not so common that players shudder at the idea of trading an item for gold.
For PvP, I'd like to see some sort of dueling/mutual hostility system implemented. What I mean is that the only way to kill another player is for both players to make each other hostile. This eliminates griefing, and this way, if you lose your gear to another player, it was your choice to challenge them, not their choice to grief you. After all, griefing is only fun for one person: the griefer. Also, players should at least keep some gear when they die, for example, maybe their most valuable items (like RuneScape *shudders* yes, RuneScape). This way, they can at least fight back to their corpse, or can get a head start on new gear, if their gear was taken by another player.
Titles which would change hands if the player holding it gets defeated by another player.
And to avoid the "gank" issue, make it possible to rip the title from your opponent if you beat him/her in a duel / challenge of some sort, in a pit-like area, with spectators around!
Personally I wish for more randomness in boss ai fights and what not, Like give them random abilities each time you fight them, Or add a new twist on beating them, Perhaps add traps and other times add platforms you need to be on to avoid something... Also would like to see more 3d cinematics from their artist.. love those things
If I was to make one suggestion for Diablo 3, it would be to include more than a story mode for multiplayer. Such as an Onslaught mode or something, where you and your friends prepare for wave after wave monsters progressively getting harder. Or like a bottomless dungeon, getting harder and harder as you go down kind of resembling Diablo 1. To just give you something to do after completing the story, maybe unlockable after beating Hell mode or such.
In this way, if you want to play a game with your friends you don't have to constantly recreate rooms to farm bosses or the such, as every few levels of the dungeon or every few waves a competant boss would be faced while keeping the game always new and refreshing in a way.
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The Auction House could also use Gold as the main currency, much like World of Warcraft. If gold isn't intended to be the main currency, then it could use whatever that currency is. Also, if a player is looking for an item instead of whatever the currency is, then there could be an option that lets the player put what item he is willing to sell that item for. For example:
For sale - Gladiator Breastplate of the Undead. Will sell for 200g or for Bonesaw of the Purple Penguin.
Now the player could choose to either give 200g or the Bonesaw of the Purple Penguin for that item.
--Siaynoq
It has been said numerous times that being hostiled is usually a frustrating thing when you are not in a dueling game and that Blizz wants to make the game very co-operative and has not commented if PvP will be in DIII. A large majority of people who play DII recieve pleausre only from dueling, as they have done almost everything there is to do in the game and are now tuning thier dueler (I speak for myself aswell when I say this).
In DII, when creating a game, there are option like the difference in level and the maximum amount of players able to join the game. Why not make a PvP option, where the host may choose whether player hostility will be allowed in the game. I believe that this will satisfy both parties, those who wish to duel will be able to and those who wish to beat the game will also be able to so in peace.
I think this is a rather simple concept that may work well.
A vibrant and living economy would bring so much to the table for Diablo III. Often in Diablo II, people would create "Trading Games" where players would barter their gear. I envision a similar idea for Diablo III, but expanded.
Gold would be the currency in the game. Even though Diablo II's economy may seem item-item based at first glance, it has always quickly devolved into a currency driven system. Be it Stones of Jordan, PGems or High Runes, people just naturally tend toward a currency economy. In my opinion, a item-for-item only economy tends to scare players away from participating. An auction system where players could immediately see the value of Item X in the economy would be great.. more on this in a bit, on to the ideas!
PvP
PvP combat is a large part of the Diablo experience for a lot of players. I think Diablo III has a lot of PvP potential. My ideas are as follows...
---I would like to see the game keep the original Diablo and Diablo 2 system of non bindable items. It keeps a flow of items around, and those that quit the game can give lucky players there items.
---Unique traded items should be sparkly on the border and have the name of the item clearly visible without hovering over it. This prevents users from switching the item before the trade is completed and scamming the end user.
---Dropping an item will not become visible to everyone else for atleast 10 seconds. This prevents you from accidently dropping an item, and another user snatching it up before you can grab it back.
Town suggestion:
---I would like to see the ability to use skills like Teleport or Leap, if Teleport is in the game that is, be usable in town. Skills that are harmless should be town accessible.
In terms of trading my suggestion is simple. Allow all players to engage in a trade window. Example, 4 players are in a room playing, and they want to do some trading. instead of having to jump between players and making offers, they instead would just open one big trade window. allowing players to talk amongst themselves about doing trades. features would include the ability to designate trades to certain players. so you could have two players do a trade not affecting other players in the window. It could also set up the ability to do three-way trades(which was one thing I hated doing in Diablo2 because people always lost items) it would generally make trading easier. This design would work best in a group of 4, and I only suggest it because it seems the idea is to only have a max of 4 players in a room at once. However, it can be tinkered with to allow 8 players you could make all the windows a little smaller to allow 8 inventories to show up. That's the other thing that makes this system great. you get a small trade window and a full view of another persons items. So you can browse their items at leisure instead of constantly having to drag and drop items into an inventory block.
This idea would make trading much easier to deal with and would allow players to avoid the headaches of trying to trade with multiple people at once that was present in diabloII.
There are no perfect characters, only progress towards...
Trading: No restrictions on trading! I.e. no "bound" equipment
economy: i think that the economy should be very item driven instead of gold driven... items allow a unique trading/barter system unlike any other game out there and yet again... keeps the diablo-ness of the game... and unique items taht are... welll... unique
gamma11 > east
While keeping that in mind though, the process for which advertisement and communication should be streamlined. A system should be in place for users to find other users selling items they want. This could be in a format somewhat like an auction house, but without the ability to bid or buy items. This way somebody could easily locate and talk to a seller in the community. This could also be used in reverse, so in case nobody is selling the item somebody wants, they can post an advertisement seeking it. Should anybody want to sell it, they can scan for those who want it. Next to the advertisement can be an area where the advertiser types in what they are seeking or offering (or they can leave it blank).
Along with that the need for a mail system should be addressed. Or at the very least a "sent when user is online" feature, so the buyer could inform the seller they are interested, or vise versa. They could then set up a time and place to meet and exchange.
Example: Player A is currently looking for Overpowered Sword. He does a scan for Overpowered Sword and finds Player B selling it. To the right of it Player B has listed some things he is interested in. Mediocre Shield, Sub-par Traveling Boots, Expensive Sunglasses, or any of the two Fake Diamond Rings. Player A, having the shield and boots can then message Player B to offer them and set up a place to exchange.
One more idea, which I think would make our lives a lot easier, is the ability to exchange items OUTSIDE of a game. Via whatever the interface is outside of individual games (currently it is a chatroom). If some system was set up to trade say, items in the stash with other players, the annoyance of setting up games might be removed. In the above example, say Player A and Player B are rarely on during the same hours due to their schedule. Player A could send a mail containing the boots and the shield in it, and in order to take them Player B would have to put the sword in and send it.
By putting a time limit on these trades (a few days or so), it would be a much simplified way to exchange and avoid many of the hassles of finding trades today.
-NonMagical
Inventory - Although I am glad to see the grid system go I hope the developers are not planning on making the diablo inventory system similar to the one in WoW. I think I'd like to see a system where you have certain "boxes" on your inventory screen which can only hold specific items. Maybe 5 boxes which can only hold weapons, 5 boxes which can hold only armor... something like that.
Armor dying - With loot being the basis of a Diablo game I think this would be a cool and fun addition.
PVP - I wouldn't mind if pvp was completley removed from Diablo 3. I find that PVP primarily adds frusteration and takes away from the immersion and epicness of a gane which is entirely PVE based. I'm sure pvp could be implemented in a way thats suits the needs of everybody but I'd rather the developers spend all their effort working on great PVE.
End Game - Instead of requiring players to farm the same bosses over and over (Baal) in hopes of drops I think it would be interesting to add randomness to the endgame of Diablo 3. How about a dungeon where players summon a random looking boss with random abilities? This would keep the endgame refreshing and require players to continually become more skillful as they are required to adapt to different variations of this boss.
Economy - The economy in Diablo 2 was horrible. Gold was useless and duped items were everywhere. Hopefully there are plans to ensure the economy in Diablo 3 will be better.
Things in Diablo 2 which Diablo 3 shouldn't change:
- Waypoint system
- The wide variety of loot
- Unique classes and cool abilities
- A variety of monsters
- Story driven quests
- Difficulty curve
- Different and unique environments
Finally, I'd just like to say that I'm really happy with the way Diablo 3 is currently looking. I think the health globe system is genius, and I'm a fan of the art design. Keep up the good work!
PvP..
Ok, duelling was fun and all in DII but clearly there was 1 major problem.. In diablo 2 you had to be over lvl 9 to be able to hostile someone.. So the problem was that even a lvl 80 was able to hostile a lvl 10.. To me this makes no sense, this cant be fun at all for the lvl 10 because he doesnt even have any good skills to defend him self. There was no lvl restriction.
Thats not the solution that i thought up of.. I honestly think people would really dislike a lvl restriction.
So basically the best option is this..
Lets pretend in diablo there are 5 acts. and the lvl cap is 1 - 99. To solve the huge gap of lvls in duelling is to have a lvl restriction in EACH ACT..
So in act 1, ONLY lvl 9 - 21 are only able to fight.. So players that reach act 2 are usually gunna be stronger, so in Act 2 lvls between 22 - 31 are only able to fight...and so on... So in act 5, only lvl 80 - 99 are able to fight, because a lvl 80 has a better chance of surviving than a lvl 10... against a lvl 99 player..
This will solve the huge lvl character gap that D2 lacked.
i really hope this idea is liked by many ppl becuz i know what i am talkin about and tryin to fix was a huge problem in D2.
I honestly think this is the best thing to improve on , and i deserve to get the beta key because up to this day i still havent played WoW...and im not lying...
THX every1
First off PvP: I never saw D2 as a big PvP type game, yea duels were fun every now and then but with the way the diablo series plays, Blizzard would be hard pressed to provide a level of PvP like that of WoW. I could see no feasable way they could fit traditional PvP(groups vs groups) or WoWish PvP(battle grounds with objectives) in a "Hack n Slash" game such as diablo, I mean "OMFG NOOB LEARN TO GET THE FLAG" just doesn't sound like something from diablo now does it? An option in keeping with Diablo's "Hack n Slash" style and still incorporating PvP would be just an "open world" so to speak. As in a game hosted by blizzard(with no character limits), that anyone can join, that allows player to just run around and kill each other with no over all objective. But personally I think they should just implement a dueling system similar to WoWs, in which both players have to agree to the duel and neither die or loses items. This would solve the problem we have all had with people joining games and going hostile with everyone and laughing as everyone quits the game.
Secondly the trading system: Make gold the standard form of currency. I REPEAT, MAKE GOLD THE STANDARD FORM OF CURRENCY. We all know how horrible trading was in d2, and how it it took hours to get anything you wanted, so I wont go into all that. A gold system in diablo would still be as flawed as d2's system unless there was some way to easily sell your items for gold. I can only see two ways blizzard could make selling easier one is a horrible idea(IMO) and the second totally depends on what battle.net 2 can do. The first is basically what Knight online does, you set up a little table with all your crap on it and a bubble over your head saying what you are selling. They could do this with just a large open area server with no limit on the amount of people in the game, aka a horrible idea(but totally doable). The 2nd part totally depends on if battle.net has a mail system, if it does you could totally do a normal auction house. If you can picture the diablo2 battle.net chat channel and games tab(which im sure you can;)), they could have a similar setup in d3 but with an auction house tab in the lobby, that is very similar to WoWs auction house where you throw up the item with a set buy out price. This would allow players to just throw up the item and go join a game or get off. With how blizzard is doing the battle.net 2.0 servers, this auction house will be for the entire server (aka the US/Europe server etc).
The only problem I see with this auction house like this, is the entire server will be using one AH, and that's A LOT of people(think well over 250,000 people)! So unless blizzard comes out with some sort of sub-server to each realm, I don't see the auction house style of trade system working without being a huge load on blizzard's servers. But the old style of trading like in d2 would be just as bad if not worse. So blizzard has their hands quite full in the trading department.
Likewise, if a player incurs lots of damage, they should receive scars and the like. If they're poisoned or cursed, there should be a physical indication.
For PvP, I'd like to see some sort of dueling/mutual hostility system implemented. What I mean is that the only way to kill another player is for both players to make each other hostile. This eliminates griefing, and this way, if you lose your gear to another player, it was your choice to challenge them, not their choice to grief you. After all, griefing is only fun for one person: the griefer. Also, players should at least keep some gear when they die, for example, maybe their most valuable items (like RuneScape *shudders* yes, RuneScape). This way, they can at least fight back to their corpse, or can get a head start on new gear, if their gear was taken by another player.
Titles which would change hands if the player holding it gets defeated by another player.
And to avoid the "gank" issue, make it possible to rip the title from your opponent if you beat him/her in a duel / challenge of some sort, in a pit-like area, with spectators around!
In this way, if you want to play a game with your friends you don't have to constantly recreate rooms to farm bosses or the such, as every few levels of the dungeon or every few waves a competant boss would be faced while keeping the game always new and refreshing in a way.