At long last, Halo: Spartan Assault is coming to the series' native platform, Xbox. Today, developers 343 Industries and Vanguard Entertainment confirmed release dates for both the Xbox One and Xbox 360 versions.
Spartan Assault will be hitting Xbox One as a downloadable game on December 24, the day before Christmas. Sure, it'll end up missing the shopping season, but at $14.99 USD, the game isn't exactly out of reach for prospective players. If you grabbed the game already for Windows 8 or Windows Phone 8 before December 15, then the Xbox One version will be available to you for only $4.99 USD.
As for Xbox 360? The last-gen console will get Spartan Assault next year, in January 2014. Both the Xbox One and Xbox 360 versions will feature over 30 missions, plus the new online co-op mode and Operation Hydra expansion pack.