Fellow Space Pirates, I just found something
amazing!! So I was kinda randomly browsing Gamefaqs and found a topic that mentioned Wolf being listed on the Smash 3DS IMDB page (for the Japanese version). Not only does it list him, it also lists a voice for Tharja from FE:Awakening (I'm guessing Assist Trophy), Masachika Ichimura is said to be voicing Mewtwo (he also voiced him in Melee), Dixie is listed with her usual voice actress, Lani Minella as the majority of the Koopalings (no Lucas sadly) who we pretty much know to be alts. There's also a voice listed for Isaac which might mean good things for him being playable but it might just be the assist. (I don't remember his Assist talking, though).
So that's all fine and dandy. But here's the real amazing part... Ridley is listed with a voice (of David Sobolov for those interested)... for the 3DS version, which we know to NOT include the Pyrosphere stage. And it seems highly unlikely Ridley is an Assist Trophy.
And unlike Snake who is listed as rumored to be voiced by David Hayter, Ridley doesn't seem to be a rumored voice. So..
if this page is in fact legit.
You know what that means...
Source:
http://www.imdb.com/title/tt3408266/fullcredits?ref_=tt_cl_sm#cast