As we reported earlier this week, the 1st Modern Warfare 3 DLC is planned to launch on January 24th, 2012, offered to Call of Duty Elite premium members on Xbox Live initially.
Recently a youtube video was posted showing the supposed 4 new maps which are to be within the recently announced MW3 DLC. Apparently, info on the DLC content is hidden within the system files for the PC version of the game, as seen in the video below.
Given that Infinity Ward has recently confirmed Park to be an official DLC map, it clearly implies that the other 3 are genuine also.
Launch dates for PS3, PC haven't yet been revealed. Xbox has a long relationship of exclusivity periods with Activision for Call of Duty DLC, however with paying Call of Duty Elite customers expecting early access to content on Xbox 360 and Playstation 3, quite a few may feel that Activision has not lived up to prior promises, if the DLC releases sooner on Xbox Live.