No, not in my opinion. I mean, there may very well be areas/maps that take place at night time in the game, if trailers can be believed. But, there are no real weather effects that I've noticed as of yet, there's nothing dynamic about it. The main overland wilderness map of EA has nothing of the sort really. The wilderness environment doesn't feel isolated, it doesn't feel wild, frankly it doesn't feel 'real'. It kind of feels 'fake', like the scenery in a play, for lack of a better analogy.
