A new job listing from hints that the platform holder might well be working on, or at least considering, a project for mobile platforms - as well continuing console creations.

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Speculation hints that the new Halo product could be heading to the iPhone, the job in question being a Software Development Engineer based in Redmond.

The specification hints that the developer will work with "console, web, and mobile to create an immersive Halo world that follows the dedicated Halo fan wherever they go."

There also sounds like there could be an dimension to the project, as we're told the developer will be designing the "infrastructure for simulation millions of concurrent users on the service," with Live mentioned repeatedly.

More from the job listing: "As an engineer on this team, your responsibility will be to deliver a great out-of-game interactive experience that takes the next step beyond the systems found in Halo 3. You will work with artists, designers, developers and testers to finalize design plans, implement those plans, and help coordinate large-scale testing of the out of game Live experience by gamers across the world. Your work also will involve several external teams-including other MGS studios and the team-coordinating dependencies and design considerations of experience as a whole."

More on this secretive role as we get it.

By Luke Guttridge