According to a report in the latest issue of PC Gamer magazine, Gray Matter Studios is currently working on an expansion pack for Infinity Ward's Call of Duty. The expansion, titled Call of Duty: United Offensive, will feature three separate single-player campaigns including the Battle of the Bulge for the US, the Battle of Kursk for the Russians, and a currently unnamed battle for the British.

Call of Duty: United Offensive is currently scheduled for release this fall. We'll bring you more information as soon as it becomes available.