To celebrate the launch of Spec Ops: The Line, 2K Games announced that DLC is coming "approximately" in August. The DLC will feature four cooperative missions set before events of single-player campaign, as well as new levels and playable characters. The greatest detail of the DLC, though: It will be free.
2K originally announced the co-op content a few weeks ago. According to 2K, in the missions, two players must work together to "fight through waves of enemies and blinding sandstorms to complete their objectives, emphasizing teamwork and utilizing a variety of weapons and explosives."