Here's another interesting topic i've been thinking about. Will there be any "new" Magic commands to be used in KH3 rather than the standard Fire, Blizzard, Thunder, Cure and those other spells? if you think about it, theres not much to think about when it comes to brand new spells but i have an idea how i could think of some ideas. i'm just gonna go through the 13 original Organization members and think of Spell ideas through their main abilities.
So first off Xemnas: Can't think of anything for him, his power is NOTHINGNESS after all.
Xigbar: he has the power of SPACE so i guess that would be Gravity so nothing on that since we already have this spell in KH1 and the other titles.
Xaldin: again already have AERO (wind)
Vexan: AGAIN we already have ICE
Leaxeaus: Now this could be an interesting one. How would EARTH be used as a spell? Sora just summons a big pile of rock and throws it at the enemy? or if we want to make Sora even more badass and just have Sora rip a piece Earth out of the soil himself and chuck that at the enemy. (probably wouldn't happen now that i think about it) i think it would actually serve as a Shield or Armor that surrounds Sora's body. that'd be pretty awesome but even that sounds kinda unlikely. Maybe it could be like Blizzard and travels in a straight line but what makes it different is that instead of piercing right through the enemy it just breaks on impact, dealing more damage. That sounds more likely.
Zexion: Again another interesting idea. How would an ILLUSION like spell work? Would it make a copy of Sora that would confuse an enemy and it would distract that enemy while it gives you the chance to sneak up on it and strike. that'd be a useful Spell.
Saix: The MOON sounds like it could be a cool spell but idk what it could be really. Maybe it would make Sora Angry and that gives Sora an Attack boost?
Axel: Obviously already got it. Got it Memorized?
Demyx: WATER would make more sense to be used as defensive Shield i think. It would be similar to Aero from KH1 when it was a Shield but it could be kinda like the Shield that the "Water Cores" uses as seen from the KH3 trailers and some segments of 0.2.
Luxord: Already Have Time (Stop)
Marluxia: Nature or FLOWERS could be a sort of poison maybe where it drains the Health of Enemies (but doesn't Heal you in the process probably until you would get a Flowerga). It would be kinda like the Flowers those Marluxia looking Nobodies spawn in the newest KH3 trailer that hey showed at Jump Festa 2016 (or 2015). But it was never proven that those spawned Flowers drain Sora's Health so we'll have to see.
Larxene: Already got it
Roxas: Something Else i can't really think of. maybe something that can Blind Enemies?
Well this is all i got: Earth, Illusions, Moon, Water, Flowers and Light. not as much as i thought it would actually but at least some fans can go ahead and start making Fan Spell Names like Lightga or Earthra and stuff like that. Those Spells will probably happen someday though, lol.