The hell you on about with "FF13/15 battle system?" Those two are nothing alike, and it just looks like KH. Or perhaps more accurately FF Type-0, based on the animations. You can clearly see the Attack command blinking, implying that it's being tapped for each slash. This doesn't look like an auto-battle system.
Anyway, good to see we're finally getting some info again, but yeah, it really hasn't been that long, especially if they can still get out the first episode by the end of the year. On the other hand, when FF15 got its big re-reveal in 2013, we still had another 3.5 years to go, and the game was completely overhauled from what we were promised.
Hopefully that doesn't happen again. Please just let Nomura finish this thing.