Looks like Sega Japan got cold feet when it came to domestic sales. Not a surprise, but I kind of hoped they would have pushed this game's graphics some more, that doesn't seem feasible anymore.
Having a demo that late, and then pushing the game out this Winter 2017, must either mean they have extreme confidence in the game or that they don't want to spend any more money on the title. I honestly expected a longer delay into 2017 for polish purposes given that the base game was on all accounts in need of some serious work. I especially expected a longer delay into 2017 now that they've tacked on a platform; since they're sticking to their target date, I don't have hopes that the Vita version won't be a technical disaster instead of refined.
At least I'll be there on TGS to play it. Gonna pre-register on the site to get the bonus chapter when I get home.