The class changes definitely have me excited the most. As much as I love my trust old Barbarian, I've gotten bored of being pigeonholed into WW if I want to maximize my farming efficiency. I'm also pretty excited for Loot 2.0 and the Paragon revamp. The current system sort of forces me into staying on one character or I miss out on a ton of magic find. Having that restriction eased seems incredible.
Im really excited for RoS because of the new game mods and new class, The game needs alot more features and stuff to do rather then just farm items. I think this expansion will bring this game back and alot of people will return,
I'm really looking forward to finding out whats next for world of warcraft and also the next D3 expac. I enjoy both games and continue to play them. Really looking forward to reaper of souls and can't wait to play it with my friends so i cannot wait to see what else they have to show about the game. If i do win tickets i cant wait to see how my first time at blizzcon will be like and see all the things there for sure!