https://www.pcgamesn.com/soldiers-heroes-of-world-war-2/steam-update

Soldiers: Heroes of World War II has been updated with a patch supporting mods, better graphics, online play, and general improvements.

I'm assuming the patch is coming to GOG, as well.

That's a random surprise.. I hope it comes to GOG.

Not to hopefull here.

I read
Steam Workshop
Steam achievments
Steam multiplayer

Beside widescreen and 4k upscaling.