This is what I wish to see in ZX3:
Both Aile and Vent playable again.
Models LX, HX, FX, and PX Double ROCK Ons back as accessible and expanded on, Model ZX expanded on as well.
O.I.S back just like it was in ZX, it was perfectly fine just the way it was, so it does not need any changes.
The Elemental weakness is perfectly fine so it stays.
Reappearance of Ciel and hopeful return of Girouette.
Promete and Pandora alive, well, and Lifespan limit removed.
And BETTER ENGLISH VOICES.
I have to say, X4's Voices are much better than ZXA's (the only mess up was X' Voice, but that was just wrong V.A. selection), IHX and X8 mixed with X4 V.A.s not a bad choice really, the guy who did Zero's X4 English Voice would be perfect with Promete especialy with his lunatic laugh in ZXA.