The Witcher 3: Wild Hunt will not be patched or updated to support the 4K features of PlayStation 4 Pro.
On the contrary, on PC The Witcher 3: Wild Hunt does support 4k gaming. DF even used 4k The Witcher 3 as a benchmark while testing a theoretical Playstation Neo hardware before Playstation 4 Pro was officially announced.
The Witcher 3 on PS4 console uses medium-to-high quality textures, while on PC textures scale up to ultra. Shadows are better on PC too. That’s why it’s hard to upgrade the console edition to support 4k gaming; because that would mean a whole revision of the game for it to work on PS4.
The PS4 Pro arrives 10th November priced £349/€399, and there are a number of PS4 games that will be patched to support the PS4 Pro 4K and HDR features, including Uncharted 4, Shadow of Mordor and Call of Duty: Black Ops 3. Indeed, all new games released after October must support it.