Infinity Ward and Activision revealed the answer.
Call of Duty: Black Ops 4 surprised the fans when the game did not included single-player campaign mode. This of course upseted the fans. However, the huge multiplayer content covered most of this problem. After this, all Call of Duty fans around the world asked the same question: "Will the next Call of Duty game going to have Single-Player campaign?" Developer Infinity Ward finally confirmed the next Call of Duty is going to have a single player campaign.
Eventhough the success of Black Ops 4, Activision and Infinity Ward will add story mode to the game. If you are a fan of Multiplayer, don't worry. Accourding to the studio, the game will also include huge and rich multiplater world. In addition to this, new game will also have "some fun co-op gameplay". The next Call of Duty game will be released this year. However, we still don't know any details about the games contents.