The concept of a screenshot with the weekly Halo Update has been brought up a few times, with no real response from Bungie - many, many people would like to see this happen. As for weather, the answer is yes. We just recently got to that stuff, which is why you haven't seen any of it in the game yet. But you will. There's a village full of polite people that has no reflective surfaces.
Every villager sees every other villager every day.
Some higher power identifies that there is at least one sinner among the people. Any person who has sinned is marked by the higher power, and must leave the village. No resident will give a sinner any indication that he is marked, but all of the sinners leave on the third day.