Hello! Just talked to dev team about the "NARUTO collector cards" mentioned in the Namco Bandai Games Europe's press release.
And I am posting this to ease your concernes!
I think most of you are concerned by the line "bonus skill and gain an advantage in the main fight.", but trust us! the game balance will not change dramatically, the main focus is the "Collection" element and not making "Super Naruto" or anything!
For more details, please wait for the next updates from our publisher
^-^
Update from CC2