Well, I've been pondering this question for quite some time. Whenever a DK sport game is discussed, a boxing game always comes to mind. There have been several clues that lead me to think one is not unlikely from happening.
1: The Boxing glove DK uses as his bat in both Mario Baseball games.
2: The very punch-out-esque Kong Boss Battles in both Jungle Beat games, and finally
3: Donkey Kong is indeed in the new Punch-Out game.
The third one is especially suspect, seeing as Mario was the referee in the original Punch-Out, and yet he makes no appearance whatsoever in the new one. This leads me to believe that perhaps they are working on a Donkey Kong Boxing game for the Wii similar to Punch-Out, but likely to take a more multiplayer orientation to it.
Do you think this is likely or not, and either way, what do you think/want it to be like?