The listings says that the team will work with an "external luminary" on the project, which has MTV thinking: Peter Jackson, duh. It has us thinking, "Are you seriously just now getting started on this?" Here's hoping we find out more about the mystery project in the coming days.
Update: Microsoft has confirmed with MTV that the job listings are for the Jackson project. "Microsoft Game Studios has been hard at work collaborating with Peter Jackson and Bungie on the development of [a Peter Jackson-helmed Halo project]. At this time, it's necessary to grow the internal team to keep pace with development. Bungie will continue to remain involved in multiple aspects of the Halo Universe with MGS."