I was thinking, since K. Rool would be introduced in a game unaffected by the 3DS transformation characters will probably return.
What if they did the ultimate K. Rool movest and designed him as a transformation character? He would just change outfits and every outfit change would morph his move set. That's a lot to consider and his character would be almost like 3 or 4 in one. However since his various costumed alter egos are such a large part of his charm and character i could see this being possible. His neutrals could probably remain the same but his specials could change as you switch between regular King, Kaptain, Barron, and maybe Krusher. When he changes his animation could be him glancing at the camera with that goofy grin like when he throws his crown in OG DKC and maybe he gets enveloped in smoke.
His King persona gives you his crown throw, charge, jump or manybe the cannonball drop from the air.
His Kaptain persona obviously gives you the blunderbuss which could have an entire set of special's based on it alone. With how many projectiles he fire's from it not to mention it can launch him foreword like rocket blast.
His Barron persona can play like a trap character where he uses his electrodes, maybe they could even have some original moves thrown in to expand on it.
Finally if Krusher is an option from DK64, he could have his glove toss, maybe turn invisible, the ground pound, etc.
He could certainly be a very dynamic character with am interesting gimic of being a 4 in one deal. I know thats a lot, and odds are IF he gets in he will probably be either an amalgamation of his appearances with his moveset or he will be based off one of his appearances but it's fun to imagine such a character.