http://youtube.googleapis.com/v/E_SAkHpNI0w
Cool new feature kinda like the Kinect feature from Halo:CEA also what looks like an improvement upon the Halo Waypoint/ATLAS apps!
At about 00:37, the user opens up a list of friends (who you should recognize) and a couple of the characters have a helmet that could only be Pilot. The closest second would be EVA. Uncertain at this time, though, since they were partially blocked.
Shortly thereafter, we see the new Sticky Detonator (AKA Rocket Pistol) being used for the first time in actual gameplay.