Blizzard's developing StarCraft II and Diablo III and maintaining the world's biggest MMO but they've still got room on their plate for more. They've just filed a trademark for a new game called Cataclysm.

The trademark, noticed by superannuation, encompasses computer games, paper products, and online games. "Paper products" means stuff like strategy guides, collectible card games, and comic books. World of Warcraft had all three.

The Employment Opportunities page of Blizzard's website previously revealed that they've got a next-gen MMO and another unannounced game in the works. Is Cataclysm one of those projects? Or is it something else like a third World of Warcraft expansion? We may have to wait until this year's BlizzCon.