If you squint, you can see some (Brute?) architecture in the background.

The reflex sight on the Battle Rifle is an... interesting choice. It wouldn't be accurate enough for the long-range engagements it's designed for, so I can only imagine that some sort of camera must be integrated into the body that can hook up with the user's helmet, same as the M6D.
Or maybe the sight is made of a smart material that can serve as an image sensor and a screen, obviating the need for a telescopic sight entirely.
343i hasn't been too good at conceptualizing advanced technology before, so I can only hope.

Anyhow, I guess I'll be the first to say it. As something that's supposed to be a part of the Halo universe, that armor is ugly. I'll admit, it's more refined and distinctive than the schlock that cluttered Halo 4's multiplayer, but it still doesn't scream "Halo" to me.