The only cast members I'm feeling out of that lot are Ciri (assuming she's either going to grow into the role or be recast in future), Tissaia and Sabrina. Anya Chalotra is too bloody young for Yennefer.
Given the casting of Calanthe, Eist and Mousesack, I'm guessing they're going to start right at the start but pace it quickly like GoT or at least condense the beginning of the saga. I can't see how flashbacks are going to work like they do in the books but I already have a bad feeling that this is going to 'based on the books' and cherry-picking the more interesting bits of the story (i.e., fights, magick and sex) and discarding/skirting the heavy political stuff that underpins the active storyline unless it's directly relevant. I could be wrong and this could be amazing, but I ain't holding my breath.
So far, not impressed.
WAIT WAIT WAIT WAIT WHO THE FUCK IS PLAYING DANDELION?