Theatrhythm: Final Fantasy is a musical take on Square Enix’s long running series from former Final Fantasy XI director Hiromichi Tanaka. The Nintendo 3DS game has songs and characters from Final Fantasy I-XIII. When Square Enix revealed the title we saw chibi versions of Lightning, Cloud, the Warrior of Light, Tidus, and Dissidia gods Cosmos and Chaos.
Aerith from Final Fantasy VII is in Theatrhythm too as a sub character. Collect crystal fragments and you can use her in battle. Snow (XIII), Vivi (IX), Faris (V), Cid (the one from III), Prishe (XI), and Princess Sarah (I) are other confirmed sub characters.
Theatrhythm: Final Fantasy is slated for a winter release in Japan.