Microsoft announced today that their Halo: Spartan Assault , title already released for Windows 8, and mobile devices, will arrive on Xbox One on December 24 at a price of about 15 €. The Xbox 360 version instead will come the January 15, 2014. Microsoft has also stated that people who had already bought the PC or mobile version can buy the title for only 5 € (we do not know if such discount will be applicable even on our territory) and that the Xbox version One turns to 1080 p and 60 fps. We leave you with a new trailer released at the announcement.