I actually prefer the brawl bair, but thats because I learned how to use it correctly and can land it really easily :x That thing is so great. You can land a lagless version on characters at low percent. And its extremely strong if used as a kill move. If they didnt change that in smash 4, I think that'll be fox's new way of killing with how big of a nerf usmash got as well as the nerf to dair.
Also Fox's fair in brawl was also pretty gdlk, especially on big bodies like bowser, dk, rob, samus, ddd, ganondorf ect. In brawl, you can easily land all 5 hits for 23%, and then combo into another fair for another 23% into an uair for 16%. It was also a legit combo unless they know to DI out of the 2nd fair. And even then you can follow up with a dair since the only way for them to DI is down. In addition to that, jumping and using fair at the same time made him jump up MAD HIGH!!! It was an amazing addition to his recovery. Hell, he could even go under smashville because of that fair recovery. So I'm pretty sad to hear that it no longer hovers like it does in brawl. Thats a big nerf right there to that move.
Since I hear that Dair pops people up, unless theyre going to be in a good amount of hitstun, I personally think this is a nerf. It makes it so Fox can no longer combo into his grab, utilt, jab, or even an down/upsmash which was I think one of his strongest options in brawl and allowed for a lot of set up. With his new dair, it seems like the best option out of it would have to be utilt which still isnt a bad option because of the added hitstun whichll be a pretty good combo starter, just not as great as it was in brawl, or melee. However...Can you combo into another dair from dair because of its ability to pop people up???
Fox's nair...So...Good. Even in brawl...N-airplane!!! Should be one of his best aerials in this game too because of the extreme mobility that it'll give him as well as being able to combo into and out of it while staying safe and on the move.
Uair...Not much to say. It's use should still be the same. Hopefully we'll some new ways to combo into it, or old ways like in melee. Shoutouts to Chillin
Laser...You all know about it. That got nerf'd pretty hard, but with the brawl engine, it kinda deserved it. The only way that I can really see it being used now is by being b-reversed on the ground.
Shine, you can no longer stall...Nerf'd again :/
ILLUSION!!! The buff to this move is pretty godlike. No longer putting Fox in the free fall animation is going to make this one of Fox's go to moves in terms of mobility, as well as maybe even starting up combos. If his Illusion ends up being like Falco's, even without the priority, or spiking ability, thisll definitely end up being one of his best moves, bar none.
My only complaint is that Fox doesnt have the incredibly low kill potential like he did in the other smash games. Its sad knowing that you wont be able to kill Mr.Game and Watch at 80%, or Meta Knight at 83%. You gotta build a little more damage since it looks like the average kill percent is probably going to be around 120-130 for them to be at a reliable kill percentage, but hey thats still really good considering how fast Fox can build up someone's percent if done right.