On the evening of November 16, Sledgehammer Games released an update to Call of Duty: Modern Warfare 3 playlists , which added four maps from Modern Warfare 2 (2022) to the shooter. The new-old locations were Farm 18, Shoot House, Mercado Los Almas and Crown Raceway.
You can play these maps in a separate MWII Maps Moshpit playlist. Along with this, the Terminal 24/7 playlist became available, as well as an experimental playlist in which enemies are marked with a red border for better visibility.
Sledgehammer Games has previously emphasized that select MW2 maps will appear in the new part from time to time, and the updates themselves are not part of post-release content support.