Place holders, and also the areas are in the disk. As in they were all mostly built at release of the game. Not to save space, but to make money. SO instead of getting a bigger game for your money. You paid for the game and another $30 for what seemed to be part of the initial game. If that is ok with you, carry on. I am not ok with it. And looking at the amount of content in Dark Below DLC. They could have just as easily released that at launch. Whyhold it back when it was only 3 missions, 1 raid and 1 strike (2 on ps4 but that strike is the same area as Black garden mission, so was already built out).