The Call of Duty: Modern Warfare 2 and Modern Warfare 3 map, Favela has been yanked from multiplayer playlists, according to this The Escapist report and the reason for it being is removed is supposedly because of "Muslim gamers" objecting to it.
The map depicts a shanty town in Rio de Janiro, but the controversy seems to be about bathrooms in the map that contains two paintings that contain quotes attributed to the Prophet Muhammad: "Allah is beautiful and He loves beauty." The objection is that these quotes are found in bathrooms.
An Activision rep told Kotaku the following:
"We apologize to anyone who found this image offensive. Please be assured we were unaware of this issue and that there was no intent to offend. We are working as quickly as possible to remove this image and any other similar ones we may find from our various game libraries.
We are urgently working to release a Title Update to remove the texture from Modern Warfare 3. We are also working to remove the texture from Modern Warfare 2 through a separate Title Update. Until the TU is ready, we have removed the Favela multiplayer map from online rotation.
Activision and our development studios are respectful of diverse cultures and religious beliefs, and sensitive to concerns raised by its loyal game players. We thank our fans for bringing this to our attention."
The maps will likely be back in rotation after the saying is scrubbed from them. Also it should be noted that this oversight was likely not meant to be malicious by the person(s) who put it in that particular spot in the map...