I can't wait for Rhythm Heaven Fever! (The game is also known in Europe as Rhythm Paradise and in Japan as Everyone's Rhythm Heaven.) As a big fan of the Game Boy Advance original and a big downer on the "flick" controls of the DS sequel, I am happy and excited for the Wii one because it is a return to form - just the A and B buttons are used in the game, no awkward gimmicks!
As Rhythm Heaven Fever was already released in Japan a long time ago plenty of videos of the game can be found on YouTube. My personal favorite from what I've seen so far is where you help a masked wrestler give an interview to a crowd of journalists.