It is listed that Naruto, One Piece and Dragon Ball Z will have a cross over event. With the poster out Bandia Namco has stated they do not own the page that is posting this information but that fans should stay tuned to it. Now the project is coming off of a page called j patrol. At the moment people think that this may hint to an American release to Shonen fighting game J Stars Victory Vs. a Shonen crossover fighting game which has Luffy , Naruto and Ichigo along with many others from Shonen past fighting it out. Their is a difference in they think that patrol man will be added to the list of J stars Victory Vs. Patrol is suppose be a Japanese release for Dragon Ball Xenoverse. This is speculation though so take it with a grain of salt. For now that is all we have if I hear more I will let you know.
Article: http://dragonblogz.com/j-patrol-dragon-ball-z-naruto-one-piece-event/
As always thank you for reading.
