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I was just thinking about the realistic day/night cycles Mark spoke of, and thought about the possibility of taking it a step further...
what about noticable darkness? To further explain, instead of the slight amount of darkness that you would see in WoW or similar MMOs, make it atually hard to see at night. Not to the extent that DayZ has, but dark enough that a skilled player could take advantage of to avoid detection if theyre careful enough. To suppliment, players can carry torches to give them a sort of 'light radius' to help them see stuff around them, but also makes them stand out.
I dunno, just a random lunch-break thought.