There's a new update and DLC for Battlefield 4 on the PC and current-gen consoles and it's completely free, adding a new map and a bunch of bug fixes.
The update adds Dragon Valley, a popular Battlefield 2 map, as well as Noshahr Canals, from Battlefield 3. In addition, the patch includes fixes issues relating to game modes, animations and audio.
The Dragon Valley map won by popular vote when the developers at DICE asked the player community which map they'd like to see remade in BF4.
The DLC is only available on the PC, Xbox One and PS4 and not last-gen consoles.