The AD I am getting SS from says - no inquiry about YG or PT version at all as of yet. So, if anyone is really attracted to PT version, you may still have plenty of chance - call the Grand Seiko retailer in your country.
According to SEIKO, GS is designed to be the ultimate "practical wrist watch". It doesn't mean that they don't want to sell YG/PT versions, but to me, SS case is good enough
Good luck!
Ken