I'd be estatic for another 3D Donkey Kong game, but if it's more open and less linear, then instead of having a wide cast of characters, have DK be the solo character who has a bunch of awesome tools at his disposal (like his roll, maybe a badnik bounce-esque platforming gimmick, vine swinging, perhaps an aerial Coconut Gun that acts as a downward attack and a slight double jump, tree climbing, etc). If you want gimmicks, you can always do animal buddies, partners, or Funky's vehicles, but preferably not more than one of those options.
Basically, make him feel awesome, overpowered, and versatile in the way that the Hulk games try to accomplish.
Basically, make him feel awesome, overpowered, and versatile in the way that the Hulk games try to accomplish.