CD Projekt Red is focused on Cyberpunk 2077: Ultimate Edition for Nintendo Switch 2. Gameplay expert Filip Downar confirmed that the developer has “all in” on this project, rather than considering an update to The Witcher 3. The sci-fi RPG was announced as a launch title for Switch 2 and will leverage new features like motion controls and gyroscope implementation. While The Witcher 3 is available on Switch via backwards compatibility, Nintendo hasn’t announced any plans for a paid upgrade or performance boost.
Source: https://www.gamespot.com/articles/will-the-witcher-3-get-switch-2-upgrade-cd-projekt-reds-lips-are-sealed/1100-6530928