I already made a thread about this, but in an attempt to make sure someone with pull sees the comment, I'll reiterate here.
I too have a bit of an issue with the hud. It's rather obtrusive and seems to bee situated in the middle of the screen instead of the outside corners(maybe for easy 4:3 support?). This really kills the immersion for me, and I would at least like an option to disable or move it as I see fit. A fading hud would also be an acceptable alternative, but the option to move it or disable certain elements would be more desirable (I really only need the minimap, and even that I don't need constantly). At the moment, this is what is keeping me from ordering this right this second, because I don't want to be staring at it for the entire length of what I hear is a long game. The environments look really nice, so I don't see why we should be fighting the hud to look at them. As I said, at least give us the option.
Aside from that, I really enjoyed the demo, though picking stuff up was a bit finicky at times.