Trailer:
- Level cap raised to 90
- New class: Monk
- New race: Pandarens
- PvE Scenarios
- Pet Battle System (Pokemon!)
- New Talents
- New continent
- Challenge Mode Dungeons
Some more info on a few of those...
PvE Scenarios:Sort of like 2-3 man instances, not tank/healer required.
Pet Battle System:This is literally Pokemon, within WoW. It sounds like it's using the non combat pets. You collect them, catch them in the wild, and make a team of 3 to fight with. There are pet collectors (gym trainers) to battle throughout the world, and you can battle other players.
New Talents:Talent trees are GONE. You'll choose a spec at level 10, then you automatically get all your base skills and some associated with your spec, as you level. Starting at level 15, and once every 15 levels after that (30, 45, 60, 75, 90) you get presented with 3 skills, and you choose 1. You can apparently change which skill choices you've made quite easily, similar to changing out glyphs. For example, Rogues at level 90 get to choose one of the following: Killing Spree, Shadow Dance, or Vendetta.
There's a TON of info and screens at
http://mmo-champion.com.