since 85% of you keep repeating the same thing over and over
I'm gonna hang by a limb and say:
1. Dash jumps
2. A mode or setting that has each preceding Smash engine (64, Melee, or Brawl gravity) as well
3. A Final smash for every special: B, ^B, <B, vB, >B
4. At least one Newcomer from every Veteran Franchise along with stage, music, etc.
5. Toybox style selection menus/ with rotating Fighter stance in the 'Combatant Selection' screen
6. More intuitive ways to block/dodge/maneauver/manipulate spacing etc. (No more talk about wavedashing, while I see and use it myself if the moment and competition calls for it)
it's just so unnatural, the tripping animation could be used as a manuevar/dodge and would look more aesthetically pleasing than sliding across the ground
7. Bring the Nintendo world to life with better character interactions: taunts, team smash attacks, multiple grapples, etc.
I should probably stop, I could go on forever, really need to contact Sakurai himself.....