Fukui Mai will be performing “Yakusoku no Basho’ for the Japanese version, which will only be available on the PlayStation 3. For the Japanese Xbox 360 version, Charice of GLEE fame will sing “New World.” Her song will also be featured in the western release of FINAL FANTASY XIII-2 across both platforms.
Yakusoku no Basho will be available from 11/23 and contain a code to unlock a bonus item in the game.
FFXIII-2 
lol it cant be leaked if the developers released it