Well I posted this a while ago when the specs were first released, but I think now that we have seen some updated footage it might be worth a slightly more "updated" opinion. My specs are
Core 2 Quad Q9950 2.8 GHZ
EVGA Geforce GTX 750 TI 2GB GDDR5
Ram 6 GB
Do you think I will be able to pull off a low 60 FPS to medium 30 FPS? Higher? Lower?
I'm suspecting you will be able to get a decent FPS at reduced resolution, 1440x900 or so. The 750Ti is architecturally well short of the minimum cards, as it has 16 ROPs to the 660's 24 and the 7870's 32. This affects its ability to handle screens with high pixel count.
But with good sub-minimum setups like yours, we will just have to see where their performance comes in.