Capcom has plans to release even more fighters for Street Fighter V even after it's released. The developer revealed that these new characters will come in the form of DLC and are currently in the concept stages.
Speaking to 4Gamer, the game's producer Koichi Sugiyama revealed some of the new characters currently in development. These include Urien, Juri, Ibuki, Alex, Guile, and Balrog--all of whom are returning characters from previous titles in the series. He said that these characters are still in the conceptual stages, at least in terms of how they'll fight.
Another development team member stated that the studio has a lot of ideas on what to do with these characters and plans to reveal more about what they'll be like in the game in the near future.