You wont create a character at all in Witcher 3. You can make decisions though.
I think you can change his looks a la mass effect
You can change his hair and armor. I believe that's all.
But yes you can make decisions. In a preview from some time ago, even decision Geralt makes in sidequests have a big impact. In one a village ceased to exist because the player decided to kill some tree monster or something.
But I agree that both are day one purchases.
I'm gonna cut out your eyes and piss in the ****ing sockets! ~ Kaine http://abload.de/img/zeronailed4xz8o.gif