Ok i've just started adding minor improvements. Here is sample (and actually everything i did so far except moving from april to december build of UDK)
On right side is of column is old material and on left side is a bit improved one. I'm not sure if you even notice any change. Now there is more micro details on surface. I'll be adding such improvements to other textures improving post proccess (maybe image grain filter an tonemapper) and adding new UDK features that i'll find to be easy to add
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I can't say that now i'll do much. I just don't have much free time to spent on that. I'm only going to make what i've learned since last update and what i think i can add without spending much time on it. I won't finish this scene soon. Just want to push it a little step further.
Fartuess