So let's see what we can say for each character mentioned here, if this is legit.
Top 5 NA
Ridley
K. Rool
Geno
Waluigi
Sora
Top 5 EU
Banjo-Kazooie
King K. Rool
Bomberman
Blaziken
Ridley
Top 5 JPN
Ashley
Lip
Sora
Saki
Takamaru
Ridley: In.
K. Rool: Not Yet Seen
Geno: Not Yet Seen
Waluigi: Consolation Assist Trophy
Sora: 3rd party, not yet seen or shot down
Banjo-Kazooie: 3rd party, not yet seen or shot down
Bomber-Man: 3rd Party, Assist Trophy
Blaziken: Not yet seen, not expected at all.
Ashley: Not Yet Seen
Lip: Not yet seen, stick MIA too
Saki: Not yet seen
Takamaru: Assist trophy.
So that's a potential pool of 5 Nintendo characters, 2 3rd party characters and a Geno.
Guess Blaziken shouldn't be too surprising, it was shown off next to Lucario in Pokken's intial teaser. Now let's watch it's support thread catch alight.