Square Enix has announced that they will be releasing Theatrhythm Final Fantasy; a game exclusive to the 3DS, in North America sometime in the summer of 2012. It is the first and only rhythm based Final Fantasy game to be released and will also feature RPG elements in its gameplay. The game will feature over 70 tracks that span the 25 year history of Final Fantasy, as well as movie scenes from the original games.
Source: Press Release via Gamespress