I didn't check out what the news about it was but they announced at least half a decade ago that Geralt's story was over and if they're creating another Witcher game, it's going to be Ciri
So I'm gonna take a wild guess and say that Cirilla, daughter of the emperor, the girl with elder blood, groomed by the Witchers to become one of them... MIGHT just be the next protagonist.
And I'm all for it. She's the future, Geralt is the past. I love Geralt, but he's so old and broken by the end of 3, it's not even funny anymore. They could do prequel games with him or something, but not a sequel to 3 at this point.