Dug this out of the Bulletin along with Haloathon and some sweet dudes on Twitter:
http://www.youtube.com/watch?v=XIkaod3wQKg
More info here: http://www.littleenglishhaloblog.com/2012/11/hidden-messages-in-halo-bulletin.html
I love the easter eggs they drop on bulletins from time to time.
Spoiler : the gist of the easter egg -
This one talks about how terminals are hidden in game, but are played through Waypoint. It also mentions they are different than Alpha Halo terminals which required a code to be entered to play. In Halo 4 you just need to find the terminal to unlock the meida.