Air sheilds, and air grabs are both good SOUNDING ideas, but were they in the game I think it would lose the feel of smashbros.
Airgrabs I wouldnt mind too much, if only a few characters had them like bowsers forward b in melee... but they should be special moves
air shields would distort smash gameplay too much and I dont see them being implemented.
As for how he's going to ''improve'' aerial combat, I have no clue. Melee is played a lot in the air, at least half the time someones doing an air move if not all the time.
We'll have to wait and see, as always.