A tweet by Yoshinori Ono offers the expected news that Super Street Fighter IV Arcade Edition is headed to Windows (thanks Joao), saying: "Thank you for waiting. Here you are! We are make prepare for Windows about AE.(Only US and Euro) ;D." A post on the NeoGAF Forums offers more on this from a press release from the recent Captivate event:

Adding new characters, an all new balancing update as well as an enhanced Replay Channel, Super Street Fighter IV Arcade Edition will deliver the definitive version of Street Fighter® when it releases on Xbox 360, PS3 and Windows PCs this summer. More specifically, the add-on version of Arcade Edition will be available as a downloadable upgrade for existing Super Street Fighter® IV owners on June 7 for 1200 MS Points or $14.99, with a full console retail product following on June 24 in Europe and June 28 in North America, respectively, and a PC version in July.