https://www.pcgamer.com/destiny-2s-big-september-expansion-will-be-revealed-next-week/

September will be a big month for Destiny 2, as it will see the beginning of Year 2, with new features including Gear Collections, Records, weapon slot changes and randomization, new modes, and more—"Yet to be revealed," as the recent development roadmap update put it. Today Bungie announced that the promised reveal will take place next week, during a livestream set for 9 am PT/12 pm ET on June 5. 

Based on the previous roll-out of expansions for Destiny 1—which saw two minor DLC drops followed by a big one, The Taken King, a year after the main game—the obvious expectation is that this fall will see the launch of an equivalent, larger expansion. Which is also what Bungie's contract with Activision points to.