While this unidentified Capcom source remains erm, unidentified, it wouldn't be a stretch for the game to bust moves on the PC. Capcom are yet to dispel or bury this.
This is likely to be a major product of the rumour-mill so don't place too much stock on this 'revelation' - Capcom are remaining tight-lipped. It wouldn't be hard to imagine Street Fighter IV coming to both the next-gen consoles as so many other beat-’em-ups have but the PC is a harder sell.
What is for sure, Street Fighter IV will be releasing in Japan on Taito’s Type X2 arcade board, which actually is like a giant PC. Hmmm.