"Leviathan will be summoned by a female character in Final Fantasy XV."
-- Nova Crystallis
I'm also not nearly as invested to some extent (partially because why be excited for something we have no release date for?). I'm of course still eager for the final product -- when it happens. Like the amount of 'fanisms' about changing small things like the dad's design (and for a character I'm not really invested in)...I mean, I just don't really care.
What fans should have more than clear by now is that the game they want so badly (FF Versus XIII) is the framework that XV was rebooted from and later expanded on the game we see now. Changes are to be expected.
Really the problem here is SQEX's bad habit of announcing their big RPGs when they are barely a concept. Which is as counterproductive as that event Marvel did to announce their Phase 3 movies when internally those plans change internally virtually all the time, and that leaves their public dates and line-up as referencial at best.