https://www.polygon.com/2018/7/13/17568802/call-of-duty-black-ops-4-beta-dates-blackout-battle-royale

Activision and Treyarch will give Call of Duty fans two opportunities to play Call of Duty: Black Ops 4 before the game launches. A multiplayer beta for the game’s traditional competitive modes will kick off in August, while a second beta, for the game’s battle royale-style Blackout mode, will start in September.

PlayStation 4 owners will get first crack at Black Ops 4’s multiplayer beta on Aug. 3 through Aug. 6. The following week, on Aug. 10, the Black Ops 4 beta will be available on PS4, Xbox One and Windows PC through Battle.net.