Call Of Duty: Black Ops Cold War is subject to plenty of rumors. The latest rumor concerns a change to Warzone's Gulag. If this name is familiar to you, Alcatraz was the setting of a Black Ops 2 Zombies map. This rumor was started by Sayuri and was relayed by TheGamingRevolution who also thinks that if this map was found in the Black Ops Cold War files. Alcatraz won't be returning as a Zombies map, but it would be coming back as the Gulag.
Nothing has been validated by Activision or Treyarch so these rumors must be taken with a pinch of salt. We will likely find out when the full game releases on November 13th.