GVT4 was able to round up Yoshinori Ono, Street Fighter IV's lead producer, for an interview at Evo 2009. Nothing earth shaking revealed here, but Ono had a few interesting things to say, like:
There's big differences between the tournaments in Japan and in America, over here we're much more enthusiastic, where Japanese players are much more reserved.
If Capcom does a follow up to SF4, they're going to rebalance it.
If there's a follow up, it wouldn't just be an arcade game, would also be on the consoles.