Forsaken, the next expansion for Destiny 2, arrives on September 4. Bungie has now revealed a new ViDoc (above) and the planned roadmap of DLC content that will come to Destiny 2 after Forsaken has arrived. There are two different paths of content depending on whether you want to spend more money on Destiny 2, which you can get for free right now with PS Plus.
Forsaken kicks off Destiny 2's fall season, which runs from September through November and is called Season of the Outlaw. On September 1, you can play Gambit as part of a 24-hour trial if you pre-order Forsaken. Forsaken officially launches three days later, and the expansion's raid, titled Last Wish, goes live on September 14. On September 18, Iron Banner returns and The Convergence map is added to the Crucible. The Breakthrough multiplayer mode comes to Crucible on September 25, along with some more maps. Festival of the Lost returns in October, but Bungie is promising a twist this time around. Continued updates and surprises will be patched into Destiny 2 throughout November.
From there, Destiny 2's roadmap splits. Each season will run three months long. What you get depends on whether you're willing to pay. All Destiny 2 players get add-ons from the free seasonal updates path. Paying for the annual pass unlocks a different string of exclusive content.
Starting in December 2018's Season of the Forge, everyone will have access to The Dawning event, as well as season rankings, the Iron Banner, new Crucible content, and new weapons--including the return of heavy machine guns. Annual pass holders get access to the Black Armory, which includes Light and Fury weapons, as well as the new Forges of the Chain activity, a Raid Lair, exotics, legendaries, and bonus rewards.
This pattern continues into Spring 2019's Season of the Drifter and Summer 2019's unnamed season, with new weapons and events unlocking for all players, and exotics, legendaries, and new activities to complete unlocking for annual pass holders. You can see the full roadmap on Bungie's blog. Bungie is keeping some of the information purposively vague for now in order to surprise Destiny 2's players down the line. In the meantime, see the big changes in Destiny 2's newest update.