https://www.gamespot.com/articles/destiny-2-getting-seasons-more-details-coming-soon/1100-6453828/

Bungie has announced that Destiny 2 will have "Seasons." Destiny 2 already mentions Seasons in the Clan settings in-game, but we don't know much about them. That's set to change soon, as Bungie will discuss Seasons in Destiny 2 during TwitchCon this month.

Bungie will hold a panel titled "The Seasons of Destiny" on Friday, October 20, starting at 4:30 PM PT. During the discussion, Bungie will talk about what Seasons mean for Destiny 2, what will change from Season to Season, and how many Seasons players can expect throughout Destiny 2's lifecycle. The game is presumably currently in Season 1, and the panel will also talk about when Season 2 begins.