And replaced it with a proper next-gen brown wash
I don't think it has a brown wash...I think you can see the colours now. Whereas before everything was...well, green. Piss green.
I guess so, but at least the old look was very stylish and had a very MGS feel to it. The new one just looks a bit too drab. I also think most footage still featuring that green wash was for the most part, usually low res or not very good quality in general. I think good HD footage of it would have looked quite good IMO.
Oh well. Game isn't out yet - many things could still change (for better or for worse).
It still has an MGS feel - and since Kojima has said there are more locations in this Metal Gear titles than ever before, there'll be plenty of styles and colour schemes. I think Green was MGS3's colour...time for something new.