Thought I would chime in since I work in the visual effects industry for film. The closer we get to photoreal CGI human beings, the weirder they look. It's a phenomena called "The Uncanny Valley" you can go look it up if you like to know more about it. But essentially it means, the closer we get to an 100% accurate representation of human beings, the more fucked up they look until we hit it dead on 100% then we can't tell the difference.
The problem is, we're only about 90% there in CGI. The technology to render a still CG image of a human is there, but the problem is, once it starts moving it begins to fall apart. We see human beings every day and even if 1 little nuance out of the 1000's of movements, lighting etc are wrong then it falls very quickly into the Uncanny valley and it freaks us out. Go watch the recently released movie Beowulf and you'll see what I mean.
I can't discuss the details of what they are doing on the movie, just know that the budget is going to be smaller this time around so that might effect things quite a bit. I'm a big fan of Norton when he's got a good director pushing him so we'll see if this turns out good.