According to ssbb.co.uk, they have already announced that Game + Watch, Ice Climbers (I think...), and someone else will not be returning. This was an old update so I don't know if you can find it anymore.
Hopefully, Aether is a rip-off of Dolphin Slash (Marth's Up+B) with an extra effect if it hits (or when used on the ground)... Hopefully...
Will smoke ball be totally useless against COM players??? Togepi's metronome shadow whatever was annoying as hell b/c comps kept destroying me.
@DoomMullet: Some characters will be replaced due to Sakurai (see above site, same update) promising that there will be no clones of characters (there is a French article or something). However... I cannot find the source again and would really like if someone could find it.