As some of you are aware, there have been many improvements to P1 on Steam and a few to P2 (with more to come). I get asked a lot about these updates, and if they will make it to GoG, and I can tell you they will.
In short, once we are done with the Steam updates, we'll strip out the Steam specific content and update the GoG builds, and in the case of P1 that should happen fairly soon as soon as Ryan is done porting whatever game he currently is to Linux.
The P1 update fixes most all the issues with the Windows build of P1 (spinning corpses, left turning issues) as well as switching to Hardware rendering so it now allows Steam, Raptrs ect overlays to work. With any luck we'll have controller support and widescreen by then too.
Sorry for the delays and thanks for the support!