Square-Enix has promised that we will be seeing post-release DLC content for the game, but has yet to provide any specific examples. We’ve gotten some hints today from Square-Enix as they announced the download content that will be given to those who buy the game at specific stores.
If you pre-order Final Fantasy XIII-2 from Lawsons or HMV, you will get a download code for a weapon for Serah. The weapon is an angel’s bow and arrow that converts the damage dealt to enemies into an HP boost for Serah.
Square-Enix has promised an image of the item in a future update.