https://www.pcgamer.com/destiny-2-forsaken-will-include-previous-expansions-starting-tomorrow/

Destiny 2 players who haven't yet waded into the waters of the expansions will have a little more incentive to do so beginning tomorrow, October 16, when Bungie will begin bundling the Curse of Osiris and Warmind DLCs with Destiny 2: Forsaken. 

Piling everything into a single package will "make it less complicated for other Guardians to begin their journey in Forsaken," Bungie said. "Every player of Destiny 2 who has yet to touch down on the Tangled Shore will need only the Forsaken upgrade. Our hope is that this will eliminate some of the questions that confront a player as they try to join our party."