Exterminatus - the free, co-op DLC for Space Marine - will arrive tomorrow on Xbox 360, THQ has said.
The company's Twitter account proposed a roll-out time of "around 9am PST" (4pm GMT).
The Exterminatus add-on is already available on PC and PS3. It adds four-player co-op via a special forces group called Exterminatus. Within it, you can choose to be a Tactical Marine, Devastator or Assault Class.
Exterminatus has two scenarios: Assault on Hab Center Andreas, and Escape from Kalkys Facility.
Developer Relic and publisher THQ have plans for more free and paid Space Marine DLC.