What's included in the upcoming "Aftermath" expansion for Battlefield 3? The new DLC will add four new maps, new "heavily modified military and civilian vehicles." In addition to the requisite new assignments, achievements, and dog tags, there will also be one new game mode yet to be detailed.

The key focus of the Aftermath DLC is its setting: taking place in the "shattered distracts, streets, and surrounding villages of a post-earthquake Tehran." The dust, rubble, and damaged terrain will factor into how you move around the environment.

From EA's official website (via Joystiq):

With operational capacity severely compromised the opposing forces must adapt and engage in vertical and horizontal urban combat amongst the dust and rubble with cracks and fissures in the terrain providing unexpected cover and paths to objectives. Additional support comes in the form of heavily modified troop transports and civilian vehicles specially adapted to deliver deadly force to the enemy.

There's no release date on the map, but it will be available early to all Battlefield 3 Premium subscribers.