I have a hard time believing anyone in here intends to purchase the PC version. How can you not have a single friend who doesn't already own this on 360/ps3? I've played the death out of the game already.
I've checked it out at friend's places but I haven't beaten the game or anything. I'm quite happy to pay for the higher resolution, less pop-in, mouse aiming control scheme and all that good stuff the PC version will bring with it. Plus the DLC will probably be free in a patch!
So yeah, there are people who will buy it.