Regarding people's expectations of the plot: Final Fantasy has been doing time-loops since as far back as the first one, so it's nothing new.
What I expect will likely happen is this:
---We could very well get an ending if we just sat around doing nothing except wandering around towns and shops all day.
---We could get an ending where Lightning turns into the "calamity" that Noel's prophecy speaks of.
---We could get an ending that makes no sense (actually a few of those, some might be funny though).
---We could get another type of ambiguous Gainax ending (something with some philosophical statement ala Metal Gear Solid 2).
---We could get a Fanservice Ending (yes you know it happens).
---We could get a really GOOD ending (but have to seriously earn it).
---We could get a SECRET ending (something that ties it with the rest of the Nova Crystalis Mythos and maybe FFXV).