VAMET: Dear pahamrick
I don't think you will have a better performance, because this patch will change retail exec to GOG.com exec to have a better performance for retail customers.
If you will have ATI it will still need a good update of drivers, it will only fix for NVIDIA 3D drivers, there will be no more need to uninstall them.
Invert mouse you may do changing one thing in ini file.
So nothing special for GOG.com users in this patch :)
I hope so you will not complain and will not be dissapointed after patch releasing :)
Best regards.
Sincerely
With the patch and the latest hotfix from ATI, I'm getting a rock solid 60fps on ultra, with texture memory set to very large, LOD set to far, and ubersampling disabled at 1080p.
No complaints so far.