Although I love Nomura's design and this "more realistic" characters and scenarios (that I hope will continue to be the main features for the series), I think XVI should go to a more IX vibe with a medieval set, stylized characters, etc...I think that should be good for a change.
Something that I thought these days and I would like to share with you is about the nova crystallis saga: don't you think it would've been great if they produced 3 games set in the same world but in different periods, a more medieval one (past = Agito XIII), a modern one (present = Versus XIII) and a sci-fi one (future = FFXIII). I think they should've used more aspects of the mythology involving the Fal'cie, L'cie and the gods to intertwine the stories in a coherent way...they even could've made some characters from the previous time to appear on the next one (Agito characters appearing on Versus XIII, or Versus characters appearing on XIII) maybe just on flashbacks about the events that changed the world or characters been released from crystal stasis after hundreds of years...of course the stories of the games as we know would have to be completely redone, but I think it'd been an interesting way to explore the mythos around fabula nova crystallis. What do you think?