Call of Duty: Black Ops Cold War Releases January 21 Update, Patch Notes Revealed Treyarch Studios released this week’s Call of Duty: Black Ops Cold War update on Thursday to refresh the game’s playlists and to take care of a few problems that’d been affecting the Zombies mode since the release of some new content there. Those changes in the Zombies mode are pretty light which means that the playlist changes make up most of this update which means it’s a pretty small one overall. Black Ops Cold War players should now be able to download the update across all platforms.