Capcom's Street Fighter IV will not be adding any new characters to its roster anytime in the near future, in an effort to maintain the core game's relevance.
While Capcom has already released two downloadable content (DLC) packs for Street Fighter IV, with the first being "Championship Mode", where players compete for points and ranking, along with the ability to record and vote on matches. The second DLC pack was five sets of alternate costumes for characters, and later on a value pack of all the skins.