Witcher 4 will more than likely allow you to Create your Own Witcher Like their last game Cyberpunk 2077.

recently an interview was done with the Game Director of Witcher Polaris and he said this regarding Future Witcher games :

“Our trademark is the freedom given to the player, but always with limits, I’ll give you an example: in Cyberpunk 2077 you can choose your character’s background, whether to be a man or a woman, but you are still always V. There is always something that has already been written beforehand that we need to create that path that the player will then have to take, This pre-definition puts you in front of very specific situations, because all our characters and our videogames have stories and they align very adequately with what we decide at the beginning,” Kalemba continues in the interview. “But the player also has to be able to have freedom, to feel that they are free, starting with the character build: our pressure point is immersion, it’s about being able to choose your own path.''

now I know some of you don't like this but I think it's a fantastic choice, its honestly a dream of mine to be able to 'customize' my own Witcher, he also say's :

“We have some elements of lore that we have to maintain, because the universe is always the same and we can’t go beyond certain boundaries, so we have to follow a very specific direction when innovating,”

this to me is an obvious meaning that although you'll have the ability to pick a female Witcher, the character itself might not be a full-fledged Witcher but more like someone who is Trained at a Witcher school and can use Witcher signs while the male Witcher's would have Cat eyes and the senses

to those who think this will Create a less interesting main character than Geralt of Rivia take this into consideration, The Witcher universe isn't Great because of Geralt, or ONLY because of Geralt, Geralt is PART of the world and you are surrounded by brilliantly written characters and dense lore and history all this contributes to the story, so having a set character that has a Gender choice like V from CP, doesn't necessarily mean the game will be lacking in terms of immersion,

it's quite clear the direction they are going it's all but confirmed at this point, I see A lot of people debating the protagonist but it's clear what they will do given the bulk of the developers are from Cyberpunk, the Systems are already in place all they need to do is port it over to the Witcher universe .

Article : https://me.ign.com/ar/the-witcher-4-polaris/170601/news/the-witcher-4-strkz-l-lhry-wllb-lmkthf