Posted
— October 22, 2009 at 12:34 p.m. PDT

Capcom is still considering releasing Super Street Fighter 4 to Japanese arcade vendors, and if they do, they said it will be an easy update process,
according to this story on Kotaku.com.
Because there's PC-ish parts running inside those arcade cabinets, all vendors would have to do is install the new software and swap out the artwork and they'd be good to go.
After initially stating that there would be no arcade release for this title, evidence keeps piling up that an arcade update seems more and more likely.