http://wccftech.com/destiny-2-first-dlc-osiris-mercury-zone/

It is a fact that Destiny 2, the new project of Bungie, will have paid downloadable content. For the moment, the studio has decided not to talk about it and concentrate only on what we will see in the base game; however, new rumors have surfaced that supposedly reveal what we will first see as a DLC. In them, it is mentioned that in the first additional content for Destiny 2 will appear Osiris.

According to Kotaku‘s sources, the first downloadable content for Destiny 2 will be called The Curse of Osiris and it will debut sometime in December.