Here are the official details on each of the three map packs for Halo 4.
Crimson Map Pack - Dec. 10
Maps: Wreckage, Harvest, Shatter
Description: Witness the chaos of a clash of civilizations in Wreckage, with its blend of claustrophobic spaces and dangerous exposures and venture into the human colony environs of Harvest, and explore a human foray on an alien moon in Shatter.
Majestic Map Pack - Feb. 25
Maps: Landfall, Monolith, Skyline
Description: Landfall’s emphasis is on infantry battles against a glittering ocean on a distant world, while Monolith exposes you to the naked vacuum of space – and the firepower of opposing teams, and Skyline’s distinctly industrial feel provides new challenges in somewhat familiar, but occasionally confined spaces.
Castle Map Pack - April 1
Maps: Daybreak, Outcast, Perdition
Description: Daybreak is set in a military facility against the backdrop of an idyllic mountain range, while Outcast plunges you into the warrens, canyons and arches of an alien edifice, and Perdition takes players into the heart of an urban sprawl, with tactical speed and situational awareness its key features.