https://www.gamespot.com/articles/heres-when-call-of-duty-black-ops-4s-ps4-beta-for-/1100-6461158/

The first beta session for Call of Duty: Black Ops 4's Blackout mode is rapidly approaching. As was the case with this month's private multiplayer beta, the first Blackout test will be reserved exclusively for PS4 players and is scheduled to kick off on September 10; Xbox One and PC players get in on September 14.

Blackout is Black Ops 4's take on battle royale. Aside from a brief glimpse in the game's latest trailer, however, Activision hasn't shared many details about the mode yet. Likewise, the publisher didn't provide much information as to what the Blackout beta will entail, but the official Call of Duty Twitter account revealed that players will have three different options to play the mode: solos, duos, and quads.