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Twelve maps from Call of Duty 4,Modern Warfare 2, and upcoming DLC have been found in Modern Warfare 3's game files.

As it was the case with Modern Warfare 2, Infinity Ward might bring back some classic maps from previous Modern Warfare titles to MW3. Four maps, Strike, Vacant, Crash, and Overgrown, were remastered with the MW2 engine from CoD 4, so it is not too far fetched that Infinity Ward and Sledgehammer Games would want to remaster some fan favorite maps and offer them as part of Elites monthly DLC drops and eventually the bundled Map Packs. Reddit user, SMKTZ, has revealed the map file for Modern Warfare 3. Interestingly, the map file contains four maps from CoD 4 and only one from MW2. Call of Duty 4 maps are Crash, Crossfire, Strike, and Overgrown along with Highrise from MW2. Just keep in mind that this is just a theory for now so don't get too excited.

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COD 4 Maps:
Crash

Crossfire

Overgrown

Strike

MW2 Maps:
Highrise

MW3 Maps:
Alpha

Bravo

Exchange

Lambeth

Mogadihsu

Paris

Warlord

This here is the picture that was released as proof of the files found.
(Disreguard the highlighted maps, they are the classic maps coming back)



All Credit:
Bulbasaur: Thanks for the heads up about the picture <3
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