Brothers in Arms house Gearbox Software has “definitely had conversations with Microsoft about doing a new Halo game,” according to a Variety report.
 
Ben Fritz with Variety’s The Cut Scene blog backed up rumors earlier this week that Gearbox is working on the unannounced Halo 4, citing an unnamed source.

The source reportedly also said there is no concrete deal in place.

Gearbox is currently developing Brothers In Arms: Hell’s Highway, Aliens: Colonial Marines and Samba de Amigo.

The developer’s website confirms that a mystery title is also in development. Gearbox president Randy Pitchford said of the mystery game, "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. I’m directing it myself. I can"t mention it publicly yet. When you find out what this is, you"ll likely agree that I can"t oversell this one."

Microsoft has yet to return request for comment, but don’t count on a Halo 4 confirmation any time soon.