Square Enix is really piling on the DLC for Final Fantasy XIII-2, aren't they? On March 13, you can download PSICOM Officer Jihl Nabaat as a coliseum opponent for 240 MP on Xbox Live or $2.99 on the PlayStation Network.
They've also announced the DLC episode "Lightning's Story: Requiem of the Goddess," which will reveal the battle between Lightning and Caius not seen in the main game. That episode is currently slated for a mid-May release, but a price has not yet been fixed.
In addition, new weapons are now available for Noel and Serah. You can get Noel's Muramasa and Catastrophe Blade and Serah's Seraphic Wing via Xbox Live for 80MP and PSN for $.99.