Short answers, pulled from the story.
Super Street Fighter IV: Arcade Edition was released on the 7th of June 2011 for Xbox 360 and PlayStation 3 as downloadable content, with physical copies available on the 28th of June 2011. The PC version followed on the 5th of July 2011.
Arcade Edition added twin brothers Yun and Yang from the Street Fighter III series as playable characters. It also made Evil Ryu and Oni playable from the start, having previously appeared only as hidden bosses in the arcade version.
Producer Yoshinori Ono confirmed the arcade version on the 4th of April 2010 during the Japanese Street Fighter IV finals. Capcom community manager Seth Killian later announced in April 2012 that Arcade Edition would be the final version of the Street Fighter IV series.
Super Street Fighter IV: Arcade Edition had sold 400,000 units worldwide by December 2011 and 1.1 million units by September 2014.
Version 2012 was a free balance patch that Capcom announced on the 11th of August 2011. It was released for console versions on the 13th of December 2011 and for Windows on the 28th of February 2012.
The Version 2014 patch, deployed on the 30th of May 2014, moved the PC version's online services from Games for Windows Live to Steam. Any downloadable content previously purchased through Games for Windows Live was lost in the transition, which angered players who had paid for that content.