As a musical counterpart to the Dissidia series, THEATRHYTHM will take the main heroes of each mainline Final Fantasy game from I to XIII through key battles and events from those games via a new rhythm and timing-based system.
The website is still in its early stages, but offers a look at the designs for each game-representing character (as opposed to just the few that were shown before) and well-known franchise enemies, 2 wallpapers for the game, and the first look at gameplay footage.
The footage is interactive so would be difficult to capture, but by clicking to go to the site, then the bottom left green bubble (or third option on the top bar if you're on the page in the picture above), then the second icon in the drop-down list on the far left, and the second option of the two that is brought up, you can find it. Click the left and right arrows to move between frames.
Thus far, the game looks to incorporate field exploration and battles with note tapping, and cutscenes from the mainline games with rhythm.
The site offers up more nuggets of wisdom also. The game is being developed by Indieszero, who made Retro Game Challenge and Electroplankton for the DS. And as of yet, the game is still slated only for Japan.