It looks like this week's Halo 4 leak was true, at least where the Crimson Map Pack is concerned. The first Halo 4 map pack will indeed arrive on December 10, featuring three new maps. The maps include Wreckage, "a ravaged environment of crashed debris," Harvest, the planet where humanity first encountered the Covenant, and Shatter, a UNSC crystal-mining facility.
Those with the map pack will also have access to a playlist exclusively featuring the new maps. The Crimson Map Pack will be available for 800 MS Points ($10) or via the $25 War Games Map Pass, which grants access to all three of the game's planned map packs (the pass is also included with the limited edition of Halo 4).
Also slated for December 10 is a new multiplayer mode called Extraction. This mode tasks each team with "extracting assets from various sites around the map." This is done by planting and subsequently defending a beacon at specific locations. Successfully defending a beacon earns a team one point. The opposing team, meanwhile, can earn points by taking the extraction site for themselves.
Check out a trailer for the Crimson Map Pack above and peruse some new screens in the gallery below.