It would be nice to see a real change in the times of day when night is real night with dark atmosphere. It could be awesome if somehow it affects your gameplay but it will require some changes in game mechanic. Back in the beginning of 2000 the developer of WoW also wanted to make realistic times of day when people actually needed torches for light since vision was very limited due to darkness at night – it is sad it did not make into release. But I believe most of people are satisfied with current situation and developers wont bother with it at all.