World of Warcraft, it's not Starcraft II, but it is, according to Blizzard, totally awesome, and it's in super-secret development by a super-secret sect of the company called Team 3. It was during a conversation about workforce with Gamasutra when Frank Pearce, senior vice president of product development for Blizzard, semi-spilled the proverbial beans. After mentioning the 40-person Team 3, Pearce would only add "Team 3 is working on something really awesome. I can't give you any hints, but it's totally awesome."
Oh, no hints? Too bad that we've already cracked the case. With Blizzcon just around the bend, hopefully we'll find out if our hunch holds water. What's your theory?