What is the release date for the Battlefield 3 Back to Karkand game pack

The Battlefield 3 game pack, Back to Karkand was release on PlayStation 3 on the 6th of December, 2011 and one week later on the 13th of December for Microsoft Windows and Xbox 360.

The game pack includes four maps from Battlefield 2 re-created in Frostbite 2; Gulf of Omen, Wake Island, Strike at Karkand and Sharqi Peninsula, ten weapons and three vehicles from Battlefield 2, as well as a new vehicle, a new game mode; Conquest Assault and assignment challenges to unlock the new weapons.