I sort of wish they just went with a totally unknown character if they were done with Geralt.
The whole "She's on a journey to become a new generation of Witcher, but she's doing it her own way" is just so incredibly boring and lame. I cannot fathom any way the devs could bring fresh air into that idea and make it interesting.
It would have even been interesting to have you create your own character for the game, but man, I simply cannot dredge up a single **** to give about the character motivation and story.