on Blizzard's main site about the new game they announced this weekend. As you can see up in the corner, the game's internal code name apparently was Hydra, so that answers the question we posted way back in September of last year about someone overhearing the name "Hydra" being bounced around the Austin GDC.
And we also know now, of course, that Diablo III isn't an MMO, which means that Blizzard still has at least one secret project running: that next-gen MMO that we've been told about via job listings. Unfortunately, we probably won't hear much about it for a while -- unless Blizzard wants to ramp up their production, three titles at once is a lot for them to work on, and even at BlizzCon later this year, we don't really expect to see a new game announcement (although they might use the occasion, if Wrath really is released by then, to announce the next planned expansion).
Still, that's one mystery solved. Maybe we'll overhear another codename this year in Anaheim, and the rumor wheel can start spinning up yet again.