Square Enix has announce the third installation to their popular Theatrhythm series, and it's called Theatrhythm Dragon Quest. On the game's teaser site we can see that it will hit the Nintendo 3DS in Japan March 23 next year. Gematsu has translated the info on the site to say that the game will be playable at next weekend's Jump Festa where it also will get its first trailer.
Hopefully the game will make it to these shores, but given it's based on Dragon Quest as opposed to Final Fantasy that's not a given.