Some changes I'm hoping to see...
Mewtwo: Teleport consumes jump/hover, but does not put Mewtwo in special fall.
Diddy: Aerial Side+B puts Diddy into special fall. Up+B loses RNG barrels.
Kirby: Forward Cutter consumes jumps, but does not put Kirby in special fall.
Pit: Side+B consumes Pit's jumps.
Lucas: PSI Magnet doesn't coast horizontally as much.
Olimar: Just give him the flying Pikmin for an Up+B. Smash 4 at least did that right.
Characters I could see wanting to change, but I'm unsure what to change, if anything at all...
ROB, Yoshi, Snake, Sonic, ZSS, Lucario, Ivysaur
Some recoveries I see players whining about which I'm hoping are left mostly unchanged because they're actually pretty reasonable...
Mario, Samus, Luigi, Wario, Charizard, Dedede, Roy, Metaknight, Link, Toon Link, Zelda, Squoitle
I know it's not uniform that Charizard should get to keep his jumps after gliding and Pit doesn't. The reason I don't think Pit should is because of how fast his glide is. So I'm thinking more in terms of close range recovery than long.
If Melee tethers are returning then that changes everything btw.