I have seen in a few screen shots that there is a blue fog that appears and remember Karl saying something about it a while back. I have also seen screen shots where the map/characters/items are brightly coloured and some that the colours are washed out in.
The colours always appear to be washed out while I am playing and I have never seen any change in colour or brightness throughout the world. Is this because my 8800GTX is too good to support indexed blended animation or is this something else?