As far as I know, the last news on the topic is that there are no plans to release the REDkit for The Witcher 3. Maybe it will be for Cyberpunk 2077, but I would not have high hopes regarding that, since I do not think it was ever promised.If they had just released redkit, that would've been enough.
There are a million of old threads with detailed information and tons of votes on what many people think are the key points where the witcher 3 is at its weakest.what should they improve? the game is already 100times better than the second. Only the intimate scenes were better.