The Crimson Map Pack for Halo 4 will be coming to an Xbox 360 console near you on December 10, 2012, Microsoft confirms. The first of three planned DLC expansions adds three new War Games (read: adversarial multiplayer) maps to the game as well as the new Extraction multiplayer mode.
Extraction pits a pair of five-player teams against one another as they compete to place and protect beacons in extraction locations to earn points. The three new maps are called Wreckage, Harvest, and Shatter. You'll be able to snag the content pack for yourself for 800 MS Points, though anyone who purchased Halo 4's Limited Edition already has a War Games Map Pass that includes all three planned DLC releases. The Map Pass can also be purchased separately for 2,000 MS Points.