https://www.pcgamer.com/call-of-duty-black-ops-4-multiplayer-beta-will-include-the-blackout-battle-royale-mode/

Activision and Treyarch have revealed the Call of Duty: Black Ops 4 multiplayer beta schedule, which will in fact see two different test sessions held: A "multiplayer beta" in August, and then a Blackout battle royale beta in September. 

The "multiplayer beta" will be available first on the PlayStation 4 on August 3-6, but will come to the PC on Battle.net—not Steam—the following weekend. The "early access" beta for people who have preordered the game will begin at 10 am PT/1 pm ET on August 10, while the doors will open to everyone at the same time on August 11. In both cases, the beta will end at 10 am PT/1 pm ET on August 13.