(I don't know the answer....
You can also run PS on Linux using WINE or CrossOver Office.
I was a PS "power-user-in-training" when I got on the Linux bandwagon. I now use GIMP for 99% of all photo work.
I think getting Adobe to port the whole CS to Linux would be a real coup---do they realize there are now more Linux users than Mac users? (I have heard this, but can't substantiate it...)