There was some speculations that the next game is gonna let the player create their own character. So, having Ciri as the main character is a surprise for some.
To be honest, I was expecting an AC style game set during the Golden Age of Witchers. The schools of each nation are thriving, magic is abundant, Witchers are respected envoys to rulers, monster population is waning but one thing remains the same: Humans slaughter eachother in droves, rape pillage and plunder. Thus proving once more that Humans are the true monsters.