This is what you have to remember. When the original game was completed Rey immediately started work on the first two dlcs , the dark below and house of wolves. They were polishing the dlcs when destiny was released. So since around October I would sAy they have been working on the taken king expansion. They have just been modifying it according to feedback from the community. As you can read from the game informer article, this is what the game should have been at initial launch. It's just frustrating that after 140$ we finally get the game that has been shown and talked about for the last 4-5 years.