Call of Duty: Black Ops' third DLC map pack, Annihilation released on Xbox Live mere hours ago, but already Treyarch's dropping hints that a fourth add-on could be in development.
In an interview with Digital Spy, design director David Vonderhaar would not deny the possibility of more downloadable content for the UK's best selling game.
Asked if Treyarch will stop at three map packs, Vonderhaar said: "I can't talk to anything beyond 'Annihilation', but keep your eyes peeled..."
Annihilation features four competitive multiplayer maps - Hangar 18, Drive-In, Silo and Hazard - as well as a fresh Zombies map called Shangri-La.
It released on Xbox Live this morning for 1200 MS Points (about £10). PS3 and PC releases will follow at a later date.