Yeah, let's bash Blizzard! One of the few companies to consistently release quality, polished titles. IMO Blizzard is one of the top 3 in the business. Not because of how much they sell, because the games they make truly are timeless.
Even if you don't like WarCraft 3 (I for one played the beta since day 1, and still even play it on a semi-daily basis after retail), I bet everyone here wasted much time on Diablo, or StarCraft. Oh, but excuse me, it's 'cool' to bash good companies nowadays, because you might not like 1 of their releases. I don't care if defending Blizzard makes me a fanboy. I'd rather be a Blizzard fanboy than a Westwood, Ubi, or EA fanboy.
Well with that said, I for one am hoping it's a new universe. Blizzard North hasn't done anything since the Diablo 2 expansion, so they've had almost 2 years to brush up on their 3D and get something started. It could also be a WarCraft 3 expansion, but I don't think that team would start it so soon after release, especially since the game is in need of an initial balance patch.
Whatever it is, I'm sure it will be a surprise.