I'm thinking they will either be episodic content (ie, you can opt to play them as a standalone thing) or post-game accessible content. If not, then that does indeed suck quite a fair bit, but I have a save on chapter 9 available to me so I can just go from there. It'll be interesting to see how they play them out, but yeah, I feel like it'll be like standard DLC, just free of charge. They can basically put everything into post-game with how they have set it up.