Some of the maps in this expansion are remakes of Halo: Combat Evolved maps. Elongation is a remake of Longest, and Warlock is a remake of Wizard.
This is the first retail expansion for a console game. Online users can get these maps through Xbox Live. The first four maps (Containment, Turf, Sanctuary and Warlock) have already been released for free and the five new ones cost $11.99, but will also become free on August 30, 2005.