I believe the last two DLC/expansions rumored after the TK will both answer some questions in the current game, and set up destiny 2's launch. Chances are, if they do plan to release anything related to the traveler, it will be a cliff hanger that leads into the sequel. I hear they plan to release two additional DLCs/expansions, post-TK. If true, that will probably cover year 2. I would be surprised if they release a new expansion for year 3. I'd be even more surprised if that surprising year three release was also available on last gen. I have a feeling, year 2 will lead up to the sequel, depending on how many more years current gen has left. As for that whole ten year plan thing. That's the franchise, and not the current game.