Brand new dlc costumes cowboy and pirate are coming to North America and will be available April 9 2013. In addition to this more dlc is also promised for later on.
Thanks and credit to gaara-kun1996 for providing the link.
And here are current dlc that is available on psn/xbl:
Originally Posted by Parak111
New DLC released: Akatsuki hats. Includes hat costumes for Itachi, Kisame, Deidara as well as a ripped cloak costume for Pain.