https://www.gamespot.com/articles/black-ops-4-confirmed-as-new-call-of-duty-game-rel/1100-6457250/

Following a great deal of speculation and apparent confirmation that 2018's Call of Duty entry would be a new Black Ops game, Activision has made it official. Call of Duty: Black Ops 4 is in development and will be released later this year --though it'll be out sooner than we're accustomed to.