Here's an example of what I was talking about with shadows hiding weapons:
Indicators are useful for that. Also, looks like weapons cast shadows now (at least static ones), has that ever been a thing? I don't remember it being in Halo 4.
Supposedly there are 3 buttons to activate the shield dome on Ascension. I've only been able to scout 2.
Skybridge:
And snipe 2:
I guess the 3rd one is somewhere around the low tower area, because the other two are almost right next to each other at high tower, but I couldn't find it in the video.
I also noticed that the spinning thinger over top mid slows down and changes direction now, too.