:/ as in this series is weird.
I guess it's a fine line between spoilers. The Witcher series is an unofficial continuation of the books, made for people familiar with the lore and also those who aren't. Geralt has amnesia so they more or less reset everything. But at the same time the series occasionally, and frustratingly, dips into assumed knowledge territory. As someone who hasn't read the books it's a bit of a pain. Yennifer was barely touched on in both The Witcher. Same goes for Ciri. Yennifer was mentioned in The Witcher 2 through flashbacks. But The Witcher 3 makes both characters hugely important when, to someone unfamiliar with the books, they don't seem to be. Then you read up on the book info and go "Oh, I get it now". And you wonder if that's supposed to be spoilers, detrimental to the story of the games, given their approach to new The Witcher fans. Or if it's not really supposed to be a spoiler at all, as said they're unofficial continuations of the books.
So that makes Ciri weird. Because there's a lot of really important massive shit to do with her that, having now read about her, would be known to anybody who has read the books. You can really clearly see where Wild Hunt is going and why. But someone who hasn't read the books won't know, and I wonder to what extent the game will explore her character. "She's returned, Geralt" doesn't really mean anything to people who haven't read the books, because she didn't exist until Wild Hunt.