Asi lo han publicado en un nuevo post en el foro oficial:
Hello All,
I have been keeping an eye on the Naruto forums to get some feedback on the game, and one of the main issues seem to be surrounded the Downloadable Content for Naruto: Rise of a Ninja.
With the recently announced Japanese Voiceover Downloadable Content and also having Shikamaru as Downloadable Content too, it does take some time to get everything sorted. It does take time to record and include the Japanese voices into the game. This means they will not be available at launch, but we are working hard to have this as FREE Downloadable Content on the XBox Live Marketplace.
Rest assured that as soon as the date drops for the Downloadable Content, you will know about it on these boards. As for any future Downloadable Content that might be planned, you will see an update on these board as well. Please keep your feedback constructive on this matter.
Thanks
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El post ese es para recoger informacion, para futuros personajes, descargas, y que estan trabajando mucho y rapido para tener cuanto antes posible a shikamaru y las voces japonesas segun el post no se dijo que que estarian para el lanzamiento del juego pero al parecer seran muchos y mas los personajes que colgaran.