I have heard from a couple people that very soon in halo reach,there will be Bungie employees playing and will be wearing some halo 4 helmets to show as a preview of the new halo.
Does not sound likely, but welcome to Waypoint.
Bungie isn’t part of the Halo universe anymore, so I would put it as unlikely.
It won’t happen, there would be a too big (more than 1GB) update…
Kinda reminds me of the GRD helmet fiasco from a bit ago. I’d say it’s unlikely, as there would have to be an update for all players to have the ability to view them.