Go to the newer Halo 4 video, and go to the middle of the second of the point 3:43 (dude, I know!) and pause! You should see the Master Chief in a sunny area, with a familiar attachment to his lower back and some sort of extra thing on his shoulders. It looks exactly like the armor ability attachment in Reach.
I may not be the first to find this, but I just found out myself and I may not be the only one.
Nah there have been sightings of this long time ago. I do not want armour abilities used like the way they are in Reach (don’t get me wrong, I love Reach and I love armour ablities), but I just feel that Halo needs to start a fresh with this new company.