The Modern Warfare 2 map "Terminal" will be released for free in Modern Warfare 3 on July 17, 2012 for Xbox 360 Call of Duty: Elite Premium members and will be available to all other players for download the next day, July 18th.  A PS3 and PC release date has not been announced, but is expected to be released mid-August.  No matter when you download it, Terminal will be a Free Multiplayer Map to all players.