Yes, DK should get his roll just like in Project M. It's actually quite a good move in there from what I've seen, and it gives DK a much better approach option when facing face to face. DK always had problems with approaching options, safe for his B Air, but that is getting predictable. Oh, and I'd love if DK had his F tilt from 64 (the punch) but being just as fast as his current F tilt (the slap) yet a little stronger.
Seeing as DKCR made the roll attack return, I see no reason why DK should keep his extremely awkward dash attack. I hope he also gets a Final Smash based on the game's ending cutscene.
It'd also be cool if DK had a sort of soundwave effect on his Forward Smash, like the attack in Jungle Beat. The more you'd charge up the Forward Smash, the stronger the soundwave gets. And it would push away the opponent a little, or even make them dizzy temporary when more up close. It'd give DK a little better pressure game, and an option to keep faster characters at bay somehow.