Have any PC requirements been released for this yet?

No (I think).

Its kind of shocking to me that no one has commented on the fact that if you own a nice video card, this game is going to look considerably nicer than the console versions.

I have a GTX670 and when I run Super Street Fighter IV @ 1080p completely maxed out and w/ Nvidia control panel set to "override" my AA settings @ 32x, it looks far nicer than either x360 or ps3 are capable of. No ugly jagged edges on the screen, and the amount of detail on the characters faces and what not looks astounding.

Fighting games like MK and SF aren't crazy CryEngine 3 games. They're super lightweight programs. I think SSFIV uses like 4 or 500MB of RAM w/ the above mentioned settings. I suspect MK9 will run similarly.

I for one am super excited to see MK9 w/ nicely filtered and cleaned up graphics.