Besides the maps that come with the games, no.
halo 3 ODST will probably come with a second disc with all the Halo 3 Online maps on it (all 21) plus 3 more. will be halo 3 format.
forge probably not but it will come with 3 new maps for halo 3 and you play fire fight and the campaign in a bigger version of nomindbasa from halo 2
haw to make mode maps in halo 3
By getting halo 3 odst ( two discs ) first disc halo 3 odst campaign and 2nd disc halo 3 mythic comes with all the halo 3 maps.
You can't. The Mythic Maps our only playable on Halo 3, not Halo Wars.
When on Halo 3 in Pre Game lobby you press start and chose Xbox Marketplace. From there you can download the maps and other Halo 3 content.
Early 2009
yes and no. You can play all the maps in the halo 3, but you have to download the rest.
i do belive there will be a forge to make maps like Halo 3 did.
play sonic in halo just download and the maps change
If by "halo 3 maps" you mean the Halo 3 Heroic, Legendary, Mythic and Cold Storage maps, then yes. However to play campaign levels, you must actually advance in the game to get to them.