Lucas:
Standard A: Multiple Kicks (it seems that RopeSnake wasnt enough

. he stole Duster's kicks lol)
Neautral Air: is he spinning sourrounded in hexagonal energy.
Up Air is he kicking up with hexagonal henergy in the tip of his foot.
PK Fire is faster, goes farther, but it doesnt create multiple fire bursts anymore, but one single burst, that doeslike 8-10% damage. Also, you can shoot them, like half a second appart from each other. Less lag.
PK Freeze is GOD. Really fast, charges quickly and freezed a squirtle with 35%. It did like 15-20% damage. It is actually useful, unlike PK Flash.
PK Thunder seems to be faster, and it seems to be easier to use for recovery. The human cannon does like 10-20% damage, goes farther. You dont fall as fast as Ness did in Melee when using PK Thunder. He never used PK Thunder as a missile.
His Smash attacks seem to be really powerful, but with not so much knockback. Do like around 20% when fully charged.
He still has Ness's second jump, but it is quicker now.
He doesnt suck

!
HIs voise is cool, except when he does his second jump, where he does some kinda squeeky noise, similar to a chubby kid. Other than that, his voice is cool. And is oviously a japanese voise actor, not american.
Ice Climbers
They both shoot Blizzard in the same direcion ON AIR, while they shoot it at different direction in the ground. Desync seems to be easier, and probably done differently.