I hate how people say it's on the disc, the only thing on the disc is access to Bungie's servers. Everything obviously isn't coded into Bungie's servers yet as you glitch into the areas and there are no enemies, the detail is low in some areas and the missions aren't there. What is on the Bungie server is the placeholder environment, when these are added to the Bungie server - if you paid for the DLC, you get the download to update to the new server rendition. Notice when we get small updates? They can throw parts of the DLC environments into those downloads so no one is the wiser, therefore filtering in the new material little by little into their server for use later on instead of having 1 large download, for those who paid for it, later on. But ya know, conspiracy theories are more exciting than the truth.