So, Halo 3 will be released in three versions:
Standard Edition (USD $59.99)
- Halo 3
Limited Edition (USD $69.99)
- Halo 3
- Metal Collectors Edition Case
- The Making of Halo 3 (featurettes, probably the ViDOCs, concept art, A/V calibration tool)
- Halo Collectors Source Guide (species, factions, story)
Legendary Edition (USD $129.99)
- Halo 3
- MJOLNIR Mark VI Game Case
- The Making of Halo 3 (featurettes, probably the ViDOCs, concept art, A/V calibration tool)
- Halo Collectors Source Guide (species, factions, story)
- Exclusive Disc (cut scenes, commentary, featurette on a day at Bungie, machinima content)
- Lee Wilson Key-Moments Story Art
Personally, I couldn't pass over the Legendary Edition and preordered it a few days ago.