https://www.gamespot.com/articles/call-of-duty-black-ops-4-wont-have-a-traditional-c/1100-6459022/

As promised, Activision unveiled a ton of details about this year's Call of Duty game during its big Black Ops 4 Community Reveal Event. One of the more surprising things we learned about the title, however, is that it won't feature a traditional single-player campaign, as previous installments in the series did.

In lieu of a single-player campaign, Call of Duty: Black Ops 4 will feature an assortment of solo missions that revolve around each of the game's Specialist characters. These will still contain the spectacular set-piece moments the series is known for, and they'll reveal each character's backstory and other details as players work their way through them.