Apart from improved visuals and Netflix-sourced content, The Witcher 3's next-gen update will bring new gameplay features.
The Witcher 3's next-gen update makes a beautiful game much smoother - The Verge
The Witcher 3: Next Gen Update - Xbox Series X Gameplay + FPS Test
Next-gen Xbox: 8K graphics, 120fps, SSD & ray-tracing - launching in 2020 - FlatpanelsHD
A Whole Lot of PS5 & Xbox Series Launch Impressions
Witcher 3 Next Gen Update Release Time and Details - The Witcher 3 Guide - IGN
First game you'll boot up on your Series X? : r/XboxSeriesX
PlayStation 5 - Wikipedia
Patch 1.5 for Cyberpunk 2077 and Future of The Witcher - News From CD Projekt : r/PS5
News - November, 2022
Coming to Xbox Game Pass: Madden NFL 23, Atomic Heart, Mount & Blade II: Bannerlord, and More : r/Games
The Witcher 3 is still on track for the PlayStation 5 and Xbox Series X later this year - Xfire