Here is some more information about the new maps for Halo2 directly from xbox.com.

"Console gaming will never be the same again, as Microsoft Game Studios has announced a June 28 release date for the highly anticipated Halo® 2 Multiplayer Map Pack. The multiplayer expansion pack, which is the first of its kind for a console title, contains nine new multiplayer maps to push gamers' skills to their limits and will be available in both retail outlets and via Xbox Live™ . The retail package also features two new videos: an animated short from the single-player story in New Mombasa and a mini-documentary that includes interviews with the map designers, combat strategies, and fly-throughs of the new maps. The retail pack also allows gamers who prefer offline play via System Link and split-screen to upgrade their Halo 2 experience with new maps. The retail version of the Halo 2 Multiplayer Map Pack carries a suggested retail price of $19.99 (U.S.)"