CD Projekt Red has provided a list of mods that will work with The Witcher 3 when the next-gen update lands.
According to the developer, it checked several of the most popular mods to see if they will work after the update. So far, 71 mods will work, but the studio also notes that while the list may not be 100%, it gives you an idea of what to expect (thanks, PC Gamer).
The mods are listed on this spreadsheet, and next to them are the folders where they can be found. It even lists whether the mod is compatible with the update.