Short answers, pulled from the story.
Producer Yoshinori Ono confirmed the arcade version of Super Street Fighter IV on the 4th of April 2010 during the Japanese Street Fighter IV finals. Playtests occurred in various arcades and appeared at Tougeki - Super Battle Opera events before the official release.
The game released on the 7th of June 2011, for both Xbox 360 and PlayStation 3 as online downloadable content. Physical media copies followed later on the 28th of June 2011, allowing players to purchase the title in stores. A PC version arrived on the 5th of July 2011, after initial concerns about piracy on the original platform were addressed.
The update added twin brothers Yun and Yang from the Street Fighter III series as playable fighters to the roster. Evil Ryu and Oni, who had been hidden bosses in previous iterations, became available out of the box for all users.
Capcom announced a free balance patch called Version 2012 on the 11th of August 2011, for all versions of the game. This update reached console versions on the 13th of December 2011, while the Windows patch became available on the 28th of February 2012.
By September 2014, sales figures reached 1.1 million copies across all available systems. These numbers demonstrated strong market performance despite initial piracy concerns surrounding the original release on certain platforms.