As promised from the news item last week, I've finished the work on the lighting engine adding both a day and night cycle (which has an impact of the aggressiveness of the enemy troops as well as combat and perception modifiers for all units), added the line of sight upgrades I mentioned before (so light no longer leaks out of world geometry) and reworked the way water is drawn to make it look a lot better.
All of these changes will be available in the next released build soon!