I'm thinking if its a fighter that Namco will be making it and it will be Tekken with Street Fighter characters redesigned to play like Tekken characters. Fireballs would only be used by the bosses (such as Bison and Akuma).
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I wonder how this will turn out. The fightingstyles of the two games are very different and won´t mix well, but then again it is the two leading fighting game companies, so they sure figure something out.