ArmA: Queen's gambit is the first official expansion pack for the critically acclaimed ArmA: Armed Assault and will feature two new story-based campaigns and two new multiplayer missions.
New story based campaigns
Rahmadi Conflict: The true conclusion to the original ArmA story, with enormous battles taking place within massive fortifications on the Rahmadi Island and brand new Porto Island.
Royal Flush: 18 months after the original conflict, a group of seasoned mercenaries arrives to help the government with a sensitive matter that the army can't handle by itself any longer. However, there is something highly suspect about this job.
New Multiplayer Missions
Urban Raid: A cooperative multiplayer scenario designed for a group of six battle-hardened Special Forces soldiers.
Battle of Porto: A "capture and hold" scenario for forty players on a brand new and beautiful sandy island of Porto.
505 Games hasn't announced a precise release date, but look out for the expansion in Q3, 2007.