Gearbox is working on Halo 4 as a launch title for the next Xbox, according to a rumor in the October issue of the US Official Xbox Magazine, Joystiq reports.

The FPS specialist, which previously handled the PC version of Halo: Combat Evolved (pictured), confirmed in February that it is working on a major unannounced project, while Microsoft owns the rights to the Halo series, not creator Bungie.

“I’ve started a new project. It’s big. It’s, like, look-at-our-line-up-and-imagine-something-even-bigger kind of big," wrote Gearbox president Randy Pitchford in a blog post earlier this year. “When you find out what this is, you'll likely agree that I can't oversell this one.”

Gearbox is known to be currently working on Brothers in Arms: Hell's Highway, Borderlands and Aliens: Colonel Marines, while its website lists an unannounced title as coming soon.