It was revealed within an interview that Theatrhythm Final Fantasy has over seventy playable songs. But, Square Enix does plan to release over fifty songs as paid, downloadable content (a process which is already moving forward). The game is confirmed to run at sixty frames per second (even with 3D enabled), although this is lessened to thirty frames per second during event music stages (“because of the need to output video”).
It’s also mentioned that, when playing mutliplayer mode, players are rewarded based on the performance of the best player in the group. This would allow someone who is not good at the game to receive better items by playing with someone who is good at the game.