https://www.gamespot.com/articles/call-of-duty-black-ops-4-bringing-back-nuketown-wi/1100-6459479/

Call of Duty: Black Ops 4 developer Treyarch held a multiplayer livestream today during which the studio showed off new footage and made some announcements. We learned that Treyarch is bringing back classic Black Ops maps Jungle, Slums, Summit, and Firing Range for Black Ops 4. These maps have been "rebuilt from the base level," according to Treyarch.

Additionally, and perhaps more excitingly, Treyarch also confirmed that the popular Nuketown map from the original Black Ops will be in Black Ops 4--but not right away. The map, which has been reimagined with a different twist, will launch in November, free for all players.