https://www.gamespot.com/articles/call-of-duty-black-ops-4-blackout-mode-gets-a-beta/1100-6461279/

PS4 owners will be the first to have a chance to try Call of Duty: Black Ops 4's Blackout mode thanks to an exclusive private beta session, but PC and Xbox One players won't have to wait too long for their opportunity. Activision has announced it will hold a beta session for the two other platforms later that same week.

The second Call of Duty: Black Ops 4 Blackout beta will kick off on Xbox One on September 14, a few days after the PS4-exclusive session is scheduled to begin. As with the Black Ops 4 private multiplayer beta held earlier in August, the Blackout beta will only be open to those who've pre-ordered a copy of the game.