There are rumors of a fourth map pack named Retaliation featuring maps such as Mansion : Castro's secret compound in cuba. Cargo : A frozen shipping center in Greenland. Metro : A urban city in Vietnam. Harbor : A abandoned shipyard in America. And finally a rumored Zombie map called Quarantine set to be in Area 51. Personally i would not be suprised if Treyarch decided to pump out a final map pack before MW3, But there is no pictures, videos or any proof of this map pack. please leave a comment of your thoughts, opinions or any other proof of Retaliation.