Halo: ODST coming late September, new co-op online mode boasted

Microsoft have announced that the Bungie developed  Halo: ODST will be hitting stores on 22nd September. A brand new co-op online mode called Firefight is also boasted to a be a big part of the game

Halo: ODST is set during the events leading up to Halo 3, telling a seprate story from that of the big green guy with the helmet.