According to Gamespot, Blizzard, creators of World of Warcraft, are developing a new MMO.
The confirmation comes by way of a Blizzard community representative, who shot down speculation that a recent spate of hiring at Blizzard was because the company was working on a Warcraft expansion. "No, it is an unannounced next-gen MMO," the rep said. "And that doesn't mean an expansion for World of Warcraft either."
So there you have it. A new Blizzard "Next-Gen" MMO has been confirmed but is not announced. When we get more details, we'll share 'em with you.
GameSpot.com: Blizzard confirms new MMOG