(Seriously? Pandaria?) Ok: A new race, the Pandaren, a new class, the monk. All that within a new Chinese-styled continent, Pandaria. There will also be a new level cap of 90, new PVE scenarios, a new pet system, and a new talent system. That's a lot of new! They're also going to renew the Horde Vs Alliance war somehow, and that will take place on this new continent.
That's it for now.