I've heard tales that air-dodging is no longer directional, but you merely keep the trajectory you have as you dodge. This would make wavedashing impossible.
Of course, this is just what I've heard. E4All starts tomorrow, so we'll know more then.
As someone who wavedashed regularly in SSBM and really don't see what the big complaint is, I wouldn't mind wavedashing returning, but, at the same time, I would prefer this game to be more different from than similar to Melee. Part of the fun was learning how to play.