Today at the Halo: Universe panel at Comic-Con, Frank O'Connor showed off two nifty easter eggs that are built into the new Xbox 360 Halo: Reach Limited Edition Xbox 360 Console. The power and eject buttons both have a tiny bit of RAM in them, and if you've played around with the normal new edition of the console, you've heard the soothing power chime when you switch it on.
But for this Halo-centric version, they've included two special sounds: power on and the console plays the Invisibility power-up sound and hit the eject button and you'll hear the Shield Charging effect. Major Nelson should have a video up soon on his site showing these off.
Also, when asked if we would see the continuation of Master Chief's story, Frankie said, "At the end of Halo 3, and cover your ears if you haven't played it, Master Chief is in cryosleep. Cortana has sent a rescue signal, and they are orbiting a strange world. We'd have to be the world's biggest assholes to not follow through on his story." At which point, the audience erupted into huge cheers.