Bluesnews has a short and sweet announcement regarding a new PC version of Street Fighter X Tekken:
Capcom-Unity has word from Captivate 11 where plans were announced for a Windows edition of Street Fighter X Tekken, the upcoming game in which brawling worlds collide. They offer details, screenshots, a Cinematic Trailer and a Gameplay Trailer, and word is: "The game will be out in 2012 on Xbox, PS3, and PC."
This shouldn't be a shocker since Street Fighter IV and the unreleased Super Street Fighter IV (as reported in a leak) are PC titles as well. Capcom has been very PC friendly. The question is whether Namco-Bandai will follow suit with Tekken X Street Fighter.