Battlefield 4's free DLC, Legacy Operations, is going to be available on December 15th, or tomorrow. This content update is focusing on making you feel nostalgic with a remake of two classic maps, one inside the other.
The second map that's included in this free update is Noshahr Canals from Battlefield 3. Because of the size of Dragon Valley, they were able to put the Noshahr Canals area inside the second harbor area, letting you enjoy one of the most played team deathmatch layouts in any Battlefield game.
The entire thing makes use of Frostbite 3 to its fullest, with an inner cloud layer to help separate air and land combat zones. This means you won't be able to get as easy a lock on air targets as you'd like. With 8 total flags in Conquest Large, there'll be plenty of map to explore.