I just came home from Costco tonight with a PSP Value Pack with Wayne Gretzky Hockey and after the initial setup i checked the firmware and I have a version 1.5!!!
I am so happy because there were only 3 left in stock. I bought it from the east end Costco in Ottawa Ontario if you want one.
Chances are, if they have them in stock they are the old versions because Costco rarely keeps things around. When they are gone they are gone.
Hope this helps if anyone is looking!