New challengers coming for Super Street Fighter 4?

Ryan "Gootecks" Gutierrez posted back in May that he heard from a "strong source" downloadable content (DLC) characters would be added to SSF4.
Capcom's Yoshinori Ono has made statements saying it's possible from a technological standpoint as well.
Super Street Fighter 4 arcade location tests start this weekend in Japan, and we should know fairly early on if any new characters are added to the roster.
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