Halo: Spartan Assault is coming to Xbox One and Xbox 360 sometime in December, Microsoft has announced. The exact date wasn't announced, but you can bet it'll show up in time for the holidays. Currently the game is available only on Windows 8 and Windows Phone 8 machines, as it has been since its Jul. 18, 2013 release. The Xbox versions, which will be available as a digital download, come with some exclusive features.