As far as Diablo 3 goes, I am really looking forward to seeing more information on the Crusader. I've always liked the Holy Warrior archetype in RPGs, be it D&D or World of Warcraft and everything in between. I am really excited to see what direction they take it in Reaper of Souls. I am also looking forward to seeing what direction they take loot; everything I've heard sounds really promising.
Gonna have to be the Crusader class. It pretty much optimizes how I want a character to play. Loot 2.0 is right up there on the list too, it'll be nice to have a new class and self-gear them from the beginning.
Besides seeing the trailer and just about soiling myself from the epicness. I am super excited about the new class. The barbarian using a shield doesn't fit him very well. But this Crusader running around and smashing people in the face sounds like a good idea to me.
I am really excited about the thing that the AuctionHouse is closing (even though its not really a part if RoS) but this will bring back player to player trade which i loved doing in Diablo 2. and Offcourse the new crusaderclass and the epic items and demons we are gonna slay