No plans at this time but Capcom wants to play the Wait and see game.

The Wii hasn't been a console to receive all the great games. CoD4, Bioshock, GRID, DIRT etc. all these games have been on 360 and PS3. Now you can add Street fighter 4 on the list of titles not yet to appear on the Wii.

In an Interview with 1up Yoshinori Ono talks about the game which is now available in Japan and the console versions. However the Wii version is yet to appear.

1UP: There's been some talk from Capcom -- I can't remember if it was you or someone else who said this -- that if there's enough demand for it, a Wii version of Street Fighter 4 could be possible. So where are you with things now? How would you view a Street Fighter game on the Wii -- would you keep it as Street Fighter 4 or do some sort of Street Fighter Kids?

YO: Yeah, it's definitely true that we've had a lot of requests for a port for the Wii. And it's definitely doable. We just don't have any plans for it yet, that's all. If we feel strongly enough that it would sell, I'd imagine we'd do it.

1UP: So is there really any question within Capcom that a Wii version would sell?

YO: Going back to my philosophy for Street Fighter, the game is essentially a tool, not just a unique piece of entertainment. I think of it like Chess; that game can be played anywhere. As long as people want to play Street Fighter 4, it could be on anything -- even this iPhone, for that matter [he points to the iPhone on the table]. It really could be on any platform that could support it. So let's just see what happens.

Who knows maybe Capcom will bring Street Fighter 4 to the Wii..........4 years from now.

 Source