A new video has been released showing the Quest Medley Mode. It seems that it will be replacing Dark Notes of the old game. Naturally your favorite quest will be able to be shared via streetpass. Also take a look at the completed song screen, there is a play style box where it lists "Stylus". How else could you play it?

https://www.youtube.com/watch?v=RGzOCGjNdOU

Buttons?

I'm canceling my Destiny preorder so I could play more Theatrhythm. Didn't expect that.

@corruptedevil: Either that or maybe it has something about Two player mode? I guess buttons and the control stick would work, I just can't imagine doing it well.