Theatrhythm Final Fantasy launches today, and Square Enix has already revealed the first round of DLC for North America. Eight songs will be available for 99 cents each (the list is after the break), with the purchase option available from a link in the 3DS game's title screen.
Square Enix did not date the release of the DLC, and it doesn't appear to be up yet. We'll find out when the songs are officially expected online. This is officially the first 3DS downloadable content in North America (or it will be when it actually shows up).
While you wait for that – and you probably don't have your copy yet anyway – enjoy the new launch trailer above.