There's plenty of different endings, but yeah that's probably the one they'll make canon.

The thing is Geralt is The Witcher, making Ciri the protagonist is a bastardization of the saga. Imagine that J.K rowling came up with a new book, titled it Harry Potter 8, and made the protagonist Hermione. To me this shows a real lack of understanding of their audience, people play The Witcher for the fantasy of being Geralt, of being a monster killer, of hooking up with every sorceress. But obviously IP sells, and they aren't gonna change the title of the saga to something like "child of the elder blood".

I wish them the best of luck, maybe they'll pull off a fallout 3 and reinvent themselves. But I personally will be passing on this spinoff.