It's DLC. This isn't an MMO, so the term "expansion," doesn't mean the same thing that it does in something like WoW. Destiny isn't going to be a [i]single[/i] game that lasts 10 years, with yearly expansions that act in [i]lieu[/i] of sequels. There will be a 'Destiny 2,' and almost certainly 'Destiny 3.' Fallout 3 had DLC that could be classified as "expansions," but they didn't [i]remove[/i] anything; they added new areas, and new gear, but they didn't negatively affect the ability to use old gear effectively. Destiny is more than capable of doing the same, but Bungie's being stubborn and controlling about it.