https://wccftech.com/call-of-duty-black-ops-4-pc-beta-dated/

The Call of Duty Black Ops 4 PC beta has been dated by developer Treyarch. It will be available on August 10th for those who pre-ordered the game and thus have been granted one day of early access, and August 11th for everyone else interested in trying it.

It’s important to note that the Call of Duty Black Ops 4 PC beta, much like the full game, will be exclusively available through Battle.net rather than Steam.