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It will have all the previous game modes and some new ones.... i cant tell you exactly what they are.

One thing for sure is that.. if u pre-order halo ODST you can unlock srg Johnsen.... YOU CAN PLAY AS SRG JOHNSEN IN MULTIPLAYER!!!!

The Halo 3 Multiplayer Disk the comes with Halo 3: ODST (Halo 3: Recon, the name was changed) includes all maps from every map pack to date as well as the original maps and three new maps only available on that Halo 3 multiplayer disk as of November 5, 2009. The disk also includes both Forge and Saved Films. The only thing it doesn't have is the Halo 3 campaign. Included Maps: Original Maps Heroic Map Pack Legendary Map Pack Cold Storage Mythic Map Pack Part 1 Mythic Map Pack Part 2

It had firebomb mode. And it will come with 2 disk one for halo 3 recon firebomb mode and one to connect with halo 3 players online

it just looks cool. does any other armor do anything special. no it doesnt

slyaer