The official Battlefield blog has confirmed the roll out of End Game - the final expansion/DLC for Battlefield 3. As has been the case with previous releases it's a staggered release plan where Premium members get it first and the PS3 platform gets a one week headstart.
PS3 Premium members: March 5th
X360 and PC Premium members: March 12th
PS3 players: March 19th
X360 and PC players: March 26th