As promised by Activision, Xbox Live users are getting the first downloadable content packs first; which will be releasing on March 20th. This is after it is made available to Call of Duty Elite subscription members on March 13th of course. “Content Collection #1” includes the Liberation, Piazza, Overwatch and Black Box maps for multiplayer. There are also two new Spec Ops missions: Black Ice and Negotiator. Black Ice involved players infiltrating and destroying a diamond mine, and The Negotiator has players rescuing hostages in India. The release date for other platforms has not been released as of this time.
[Source: Joystiq]
