Has there been any word of wether there will be a SF4 manga or not? RYU FINAL was fantastic, id love to see nakahira do an sf4 tale.
I’ve heard nothing about a Street Fighter IV manga from Japan. Would be awesome though! Still Masahiko Nakahira is busy working on his own manga Sadamitsu The Destroyer so I don’t expect anything from him right now.
If you like his stuff there’s a short anime based on Sadamitsu The Destroyer that’s available in English. You may want to check that out. 
That Sadamitsu series of his also spawned a 10 ep. anime and is also licensed in English.
Ive been wondering too. SFIII Ryu Final always added a bit of epicness in my play time with the SF3 games. Im also waiting for Capcom of Japan to do something Manga related with the new SF games.