Project "Hydra" For Reals?

Some time ago, I brought up Project "Hydra", Blizzard's code name for their (rumored) super-secret new project. Turns out that the rumors are true--Shacknews reports that, during Blizzard's Worldwide Invitational:

"[Blizzard VP Rob] Pardo affirmed that Blizzard's recent job listings for an 'unannounced next-gen MMO' were not related to Diablo III. The company had previously stated that the project was not a World of Warcraft expansion either."

So, what is it? Who knows. But at least we know it's real.