Doesn't K. Rool have issues gettin' into Smash 'cause of copyright 'n such because of Microsoft's acquisition of Rare? I recall that bein' a very frequent point made back in the days of the "the One Character That Would've Made Brawl Perfect" thread's activity.
That aside, I'm very confident we'll see another DK character get in. K. Rool would definitely be a great choice considerin' worthy DK villains are few and far between far as I know. Fan demand is there as well. If these copyright issues ain't an actual thing, my vote's definitely for 'em.
However, my knowledge of Donkey Kong lore 'n characters is few and far between. I sure as shit know Dixie wouldn't just be some clone'a Diddy, but I don't know enough t' give the character a vote as of now. Enlighten me, yeah?