I do not know anything about it, and should probably take a look eventually, but after my time with 12 and 13 I find myself caring very little for most of FF's offerings.
Expecting the diehard FF7 fans to ever admit there is anything better in the series than it is probably pretty naive though. Older games have longevity of fanbases if they got popular at all, so it's probably too late to exceed what 7 created without an absolute miracle. (Not to mention how much FF7 spinoff material there is just continuing to fuel the flames/cash in on the way it's revered.)
Also, if it's been in development for a long time, don't get your hopes up anyway. Remember, it could be another Duke Nukem Forever.
(Don't get me wrong, I WANT it to be good, to rekindle my interest in the series, but I'm skeptical by default of Final Fantasy as a brand after my most recent forays into it [minus XIV which I really should remember to play more when I get my subscription re-upped again if I don't blow all my Steam credit on other games, but that's neither here nor there].)