I feel that there should be some improvements with lighting, like HDR and making it so shadows and lights don’t de-load (or disappear or whatever) when you travel far away from them.
I wouldn’t mind more things along these lines, and actually, the one person who did the hack week thing where he did all kinds of lighting changes did most of what I would like. Where smoke and transparent colored parts change the color of the light, as well as the neon material and stuff.
[video]http://www.youtube.com/watch?v=XymOYkMIljY