If you choose to pre-order Final Fantasy XIII-2 from GameStop you will be receiving the already announced bonus outfit for Serah. We don’t yet know what the outfit will be. GameStop has also announced that they will have yet another bonus for pre-ordering, should you have a Power Up card.
The “Genji Bow” will hasten the ATB gauge for Serah, similar to Noel’s “Calamity Blade.”
If you would like to pre-order the game through GameStop, you can do so here.