Although producer Yoshinori Ono had stated otherwise, it seems that the additional characters inserted into the arcade edition of Super Street Fighter IV will find their way home via DLC for the PS3 and Xbox 360. Yun, Yang, Evil Ryu, and Oni were inadvertently leaked by a site (likely from Capcom’s Captivate event according to Joystiq). The video was then pulled, as were subsequent mirrors, although surely it’s still floating around somewhere, if temporarily.
Since this loose announcement was a leak, there’s no word yet on pricing or a date, but for the record, it’s much easier to plunk down for characters than a cowboy outfit for Ken. The question remains if the recently released 3DS edition can be updated to include the roster additions, which was the most complete version to date since it already had the costumes and such on the cart.