One of the first 3DS demos is getting a sequel. In an interview in this week's issue of Weekly Famitsu, Square Enix producer Tetsuya Nomura revealed that a second demo for Theatrhythm Final Fantasy is being planned for release in early February. The demo will consist of two songs, said Nomura.
While Nomura did not share a specific date, Theatrhythm sees release on February 16, so the demo will presumably be released before then.
Nomura also confirmed with Famitsu that Square Enix will release downloadable songs for the game following release. The hope is that players are able to play the game for a long time. He did not say if the content will be paid or free.