Dengeki PlayStation has reported that no additional characters for Super Street Fighter IV Arcade Edition will be released post launch. Arcade, which was officially announced this month, will be made available as DLC for PS3 and Xbox 360 on June 7. A disc version for both consoles and PC is slated to hit stores starting June 24 in Europe. It will run you $14.99 whether you purchase it digitally or on disc.
Thanks to Andriasang for the info.