Damn I guess this will finally give me a reason to upgrade my aging computer. I don't like the makeover they given Geralt, hopefully they change it back to his original style from the first, and the voice actor doesn't sound the same, but that's most likely because they haven't found a publisher yet so they didn't sign on the original actor. Besides that, I cannot wait for the game, looks to be better in every way.
Also, the reason the Witcher is linear is because of the storyline itself. You aren't chosen to save the world like in Dragon Age or Mass Effect. Geralt is a wanderer and takes whatever comes his way basically. It would make no sense to have an open-world game with the Witcher, it would contradict the entire story and backstory of Geralt.
And yes, I have read both novels.