In the latest Famitsu issue, it was announced that near (or around) February 28, the Final Fantasy XIII-2 will be releasing new download content. Apparently, Sazh will have his own download scenario and Serah will have a downloadable swimsuit costume. Just as a side note, the swimsuit outfit is just for Serah.
In addition, it appears that there will be a new casino game that players will be able to incorporate into FFXIII-2, as well as a knight costume for Noel and an unannounced secret piece of download content.
As for the pricing of the DLC, the costumes for Serah and Noel will cost ¥300 (240MSP). Sazh’s scenario will cost ¥600 (400MSP).