It was today that Capcom announced that it is bringing Street Fighter Alpha to Sony's PSP handheld.
Right now, we don't know much about the PSP version of Street Fighter Alpha. The game will feature "Network Versus" play (which may or may not mean online play). Also, there will be a new "Battle Mode," though we don't have any details about that.
Street Fighter Alpha is scheduled for a Q4 release. We'll be sure to update when we get any new info or media, most likely from E3.