Halo 3: Three Editions

So the upcoming Halo 3 is going to come in three editions:

The Microsoft/Bungie marketing machine is cranking up.  We now have more details for the upcoming, sure-to-be-blockbuster Halo 3 versions you will be able to purchase this Spring (southern hemisphere)
Fans can shell out US$129.99 for the Legendary Edition of Halo 3, three disks packaged in a 'Spartan Mjolnir Mark VI helmet' shaped case.
Disk one will obviously be the much awaited final installment in the Halo trilogy, seeing the Master Chief back on Earth defending against a Covenant and Flood invasion.
The other two disks contained in the Legendary Edition will feature supplemental bonus material such as a HD "making of Halo 3" doco, behind the scenes footage, early game concepts and evolution.  There will be featurettes concentrating of the Bungie Halo 3 team showing them working on graphics, audio and creative design for the game.
The disks will also include an audio-visual calibration tool so that players can optimise their specific home theatre set-ups to get the most from a Halo 3 experience.

No doubt someone is already working on what they're going to put in the fourth different release for Halo 4.