One of the Blizzardians has been getting a bit talkative over on the Blizzard boards and has stated that the next MMO is an entire new property. No WoW2, no World Of Starcraft. He seems to think that the Internet already knew that, but I can't recollect when it was confirmed. Blizzard poster "Zarhym" said: “We have nothing to advertise for the new MMO because it's a shell of a game thus far. We've already stated it'll be a brand new franchise, which means the lore, art, and game play are being developed entirely from scratch. It's an overwhelming process, but a process through which we excel. Our track record supports this.”
Oh, and Grunty The Spacemarine Murloc (above) will be the in-game gift for BlizzCon attendees this year. Cute.