While he does make a note that hints at possibly a cameo, based on an interview with Nomura this summer past I'm not expecting to see any significant FF-based character presence in KH3.

I'm not hugely surprised if that turns out to be the case, personally -- there's no FF influence to speak of in UX, there was only the inconsequential Zack cameo in BBS, and DDD just featured TWEWY characters who could have been find-replaced by anyone with no affect on the game's plot or backstory. Even moogles are less prominent in their own way.

We'll see what if anything in KH3 he's dancing around soon enough, though --?