Part3 now:
-The D3 engine is fantastic, D4 will be on an updated version. Always online of course. Warden (or a new thing) will also be reinforced so things like maphack will be insta-banned (at least the the design goal) unlike what happened to D3. Hopefully this will screw bots faster than it happened in D3. They are very aggressive about this, this time, about game integrity.
-All classes from D3 will be back and 2 more at launch (they are not pertinent for me to spoil, you will know this at Blizzcon anyway, but one of them is a fan and, one of mine too, favorite...), however they will be very different because of the events in D4.
-Last freaking year there was a freaking HUGE D4 clue at Blizzcon and almost nobody gave a damn??!! WTH guys??!! On really big panels where you saw all of Blizzard's franchises, there was a female Crusader representing the Diablo universe, however she was tainted, hurt, corrupted but still fighting for the light... she was not "normal" it was obvious but people didn't look into it like at all if I remember lol. Diablo 4 was already in development for quite some time (unknown how long exactly). She was not representing Diablo 3. She was representing Diablo 4. Go take a look and be amazed.
-There is a video of a guy explaining how the Diablo D4 dice (part of Diablo themed dices in Blizzcon 2016 goodies bag that the press I guess got samples in advance) is not a manufacturing mistake but a cryptic clue at D4's existence. That guy is a smart cookie, he totally nailed it. It is not a manufacturing or design mistake. I mean this could be obvious to some but his analysis is really on point for others.
-The classes will all be hurt and changed like the Crusader girl, this will explain why some skills, mechanics etc. change from a lore or rational perspective (to interate on D3, to make it even "better", D3 has gotten pretty good over the years).
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i want D4. plain and simple. im happy if they are firing people from D3 vanilla team. D4 needs fresh minds and it needs to stay away from anyone likes WoW. Wow style graphics, epic things and all that stuff belongs to WoW but not to diablo. i hope blizzard understands that now... im still angry and i cant forget how D3 vanilla team mocked us with rainbow & unicorn tshirts when we said this. diablo needs dark atmosphere, and in diablo, you need to feel somewhat trapped, alerted etc etc...
RoS team, is another thing to discuss. i liked what they did on most parts, after all, they had to expand a flawed game.. and its always harder to work on a flawed game rather then creating a new one. so RoS team made great fixes, they did their jobs well. i can be happy with most of them staying and woking on D4.