OP claims this characters will join the roster:
Newcomers:
King K. Rool
Decidueye
Ashley
Isaac
Ayumi Tachibana
Excitebiker
Heihachi Mishima
Travis Touchdown
Echoes:
Dixie Kong
Chrom
Dark Samus
Isabelle
Now, the person that came up with this shared "leaked" images of K. Rool and Heihachi:
Spoiler: Spoiler because of big images (click to see content)
Now, ignoring the fact that Heihachi's logo is just "TEKKEN" and that his model looks rather unfinished, take a closer look at K. Rool's pic and you'll see a fatal flaw:
Spoiler, click to toggle visibilty
There's a spelling error in his name!