Reddit users DsmvwldCmmntr and DainBramage77 seem to have found game files for the Modern Warfare 2 map Terminal in Modern Warfare 3, suggesting that a "nostalgia map pack" might be released for the game soon.
DsmvwldCmmntr also found loading screens for the April and May maps and the new Face off maps. Below are the loading images for Terminal, Oasis, Foundation and Sanctuary. There are also the Face Off maps RestRepo, Hillside, Courtyard and Aground.

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