Call of Duty: Black Ops Cold War Trailer Reveals Best Look Yet at New Zombies Map Treyarch Studios and Activision released a new Call of Duty: Black Ops Cold War trailer for the Firebase Z map to give us out best new look at the Zombies battlefield that’s releasing next week. Perk dispensers, mechanisms that rocket players across the map, superpowered zombies, and of course some story implications for the ongoing Dark Aether narrative can all be seen in the map’s first trailer. Black Ops Cold War players will be able to experience all this themselves next week when Firebase Z releases on February 4th as part of a new Season One update.