https://www.gamespot.com/articles/destiny-2-forsaken-dlc-release-date-new-mode-trail/1100-6459402/

Destiny 2's Forsaken expansion will launch on September 4, developer Bungie announced today during a livestream event. The expansion, which follows the Warmind add-on in May, is a big one. As outlined in a mini-documentary that you can see in the embed above, Forsaken adds a lot to Destiny 2.