You might remember MW3’s first DLC being leaked. Apparently, there is another map hidden in MW3 files.
Reddit user Fury Hunter found a map called Coast, which seems to be in its early development stages. This leads us to believe that it will not be packed in the first piece of DLC.
Fury Hunter has also found the loading screens of Call of Duty 4’s Strike and Crossfire. This goes with the old report of old maps being in MW3.
Also, Arkaden used to be “Plaza”, featuring a different map layout.