Currently, this new Black Ops game is planned for a launch in 2024 around roughly the usual time in late fall/early winter. Windows Central suggests that some kind of major pre-order bonus is in consideration at Activision, which would include multiple days or even weeks of early access to the game.
Treyarch contributes to all Call of Duty projects, but Call of Duty 2024 will represent the longest development time Treyarch has ever put into a Call of Duty title it's leading. As such, some of the expectations will be probably higher than usual.