Exactly just because it was the last update, we decided to revamp the entire game, rewriting pretty much everything. We added a bunch of new scenes, reorganized and made the overalll experience much better, clarified some story elements and yeah, it's just so much to it, we've been working our assess off for this, not only day 10 but all the earlier days.
It also gave me a chance to really change things in the engine for the better, make the game load better, smaller, and faster, more reliable. The way we changed everything it wouldnt have been possible to use your saves anymore, paths are changed.
If you skip the early days you will miss out on key story elements and a bunch of new scenes, so many things.