Microsoft has announced that the first map pack for 343 Industries' Halo 4, dubbed Crimson, will be released on the 10th of December.
Crimson will include three maps called Wreckage, Harvest and Shatter. Wreckage has been built for King of the Hill and Capture the Flag, Harvest is also said to suit Capture the Flag and Shatter is said to suit Dominion and Extraction, a new game type that also comes with the Crimson pack.
In Extraction Mode, you will enter a 5 vs 5 environment that's objective-based. The objective is to plant a beacon and protect it against another team while you're attempting to extract.
The pack will cost 800 Microsoft Points when it releases and will add eight new Achievements to Halo 4, adding an extra 250 Gamerscore.