07/06/2011: "Final Fantasy Rhythm Game Announced for 3DS"
Yes, you read that right. A 3DS game called Theatrhythm Final Fantasy has been revealed in this week's Jump, and is described as "Theater Rhythm Action". There are dungeons, towns, and battle scenes, with touchscreen-controlled rhythm elements. The music is, of course, from previous Final Fantasies.
The characters are rendered in a chibi style, with Cloud and FFXIII's Lightning confirmed to be appearing. The story seems to be a traditional Final Fantasy-style one involving a crystal.
Not much else about the game is known at this time.
Source: Andriasang - 3DS Final Fantasy Rhythm Game Announced
ETA: A scan from Jump featuring the game can be seen here.
Posted by Reeve at 12:21 PM EST