https://www.gamespot.com/articles/destiny-2-new-crucible-mode-coming-next-week/1100-6461954/

Destiny 2's unique Gambit mode has been the highlight of the new Forsaken festivities, but Guardians with an itch for a more traditional PvP experience can scratch it with another new mode incoming next week. Starting Tuesday, September 25, players can jump into the new Breakthrough mode in the Crucible.

Breakthrough is a multi-phase mode. First, players fight over a central zone. Whichever team captures that zone deploys the Breaker. The losing team can still fight over the zone to take control of it and deploy their own Breaker. Once the Breaker is captured it can be used to hack the enemy Vault. The first team to hack the Vault wins, and if you're in the process of hacking when the timer expires, you enter sudden death. The best of three wins the match.