The new COD4 maps will be available in April and will cost 800 MS Points (same pricing for PSN). Along with the map pack will be a few minor changes to the game, including a tweak to Clan Tags to re-allow special characters.
Make sure and head over to the Call of Duty 4 pictures area to see screenshots of the new maps!
Broadcast
Its size and alternating routes make "Broadcast" great for large team games. A large, multi-story television station with plenty of window vantage points creates the perfect setting for floor-to-floor combat. The station is surrounded by extensive outdoor areas consisting of a long parking lot, surrounding buildings with sniping hiding spots and side-rooftop access to the top and bottom floors of the television station.
Creek
A large wide open village in the woods, "Creek" consists of heavy foliage, great for sniper cover: a deep ravine offers an excellent vantage point for ambushes; an underground cave offers an alternate evasion route; and various multi-floor houses populate a patchwork of connected farmland. This extensive open map is great for snipers with plenty of natural coverage consisting of rocks and trees. There are various routes for advancement from both high and low vantage points over and underneath the hillsides. Another great map for large team games.
Chinatown
A modern revision of the classic Call of Duty "Carentan" map, "Chinatown" takes players to the foggy downtown district of a Chinatown. A night time setting, the cityscape is well lit by the full moon and the glow of brightly colored lanterns and neon lights from local businesses. This district offers a variety of open-street and interior settings, perfect for fire fights throughout the connected roads, courtyards, antique shops and markets within it. Great for all game types and players.
Killhouse
"Killhouse" is an enclosed warehouse made of plywood structures, mock-ups and speed-run courses used for training, creating the right mix of obstacles for small team games or free-for-alls with a variety of soft and hard cover points spread throughout the entire ground level.