Square Enix just issued a press release detailing the bonus item that customers that will preorder Final Fantasy XIII-2 at Lawson And HMV (in Japan of course) will receive.

Every preorder will grant a code to download the Seraphic Wing, a weapon for Serah that will allow her to drain energy from the enemies she hits, transferring damage dealt into her own life pool.

No picture has been shown at the moment, and no info of preorder bonuses have been shared (but at this point it's pretty safe to assume that they will come).