I dunno... The Prima/Nintendrone thing may have been similar to the Melee leak, where the original leakers were like, "No, it's fake. SORRY!" when fans got incredibly irate over the list including Pichu, Doc, and the like. Of course, a few months later we were all shocked when the leakers were LEGIT.
It's a strange coincidence that all the characters are in Dojo order, including the newly revealed ones, with the Prima list. We can't ignore that. People can say stuff is fake and be lying too.
EDIT: but then again, it has Mewtwo who Serebii semi-deconfirms. Hmm..