https://www.overclock3d.net/news/software/the_witcher_3_s_pc_version_now_looks_better_than_ever/1
 
The Witcher 3's PC version stands as the best incarnation of the game. It offers graphical capabilities that extend past the game's PS4 and Xbox One editions while also providing support for higher framerates. Beyond that, the PC version includes something that the console versions never will, moddability, enabling the game's enthusiastic fanbase to improve upon CD Projekt Red's already impressive work. Today, we will be highlighting one of The Witcher 3's best texture mods, The Witcher 3 HD Reworked Project 10.0, which released today. 

Halk Hogan's The Witcher 3 HD Reworked Project version 10.0 brings with it "over 1000 reworked textures" and "over 250 improved and reworked models". Put simply, with this mod The Witcher 3: The Wild Hunt looks better than it ever has before on PC. This is especially true for users of ultra HD displays.  
 
The Witcher 3's HD Reworked project Mod is currently available at Nexus Mods as a free download. 

Hoggle
It does look like they did a great job on it. I just wish that CD Project Red would have done it since I think Witcher 3 would is going to be a game people will play and talk about for over a decade. If Cyberpunk 2077 is as good as it looks I could see people going back and checking out Witcher 3.

More likely to see GOG do it than CDPR. There is no money in it for CDPR to do it unless they do a Redux version and sell it.

Here is the teaser video