Halo 3

I'll post it in here, rather than making a new thread.

An image of the Collectors Edition of Halo 3 has been released. Whilst much is still unknown about the purpose of it, there's a second game disc:

http://uk.xbox360.ign.com/articles/795/795238p1.html

On the subject of the second disc, the article says:

It's possible that this Game Disc Two is extra material separated out from the main disc for a purpose. (Maybe this is extra bonus material or the game's multiplayer component? Or maybe disc 2 contains material that can be installed onto a HDD for those who have one and want one seamless session played with the key disc 1?)