DICE has confirmed the release of Star Wars Battlefront's free content patch for March. It includes a new survival mission, Rebel Depot, and a new multiplayer map, Survivors of Endor, for the Walker Assault, Supremacy and Turning Point game modes.
This new content is not tied to the Outer Rim paid DLC that is due to be release sometime later in March, which is set to include new heroes, new maps, new weapons and a new mode. You can get more details on that here.
The March update is available across all three platforms.