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Nope. At the moment they're exclusive to Halo 3: ODST. The free codes would have to come after the game is released.
Posted by: Forgewolfbut if the Battle Rifle is not in there, I'm may not buy it.What a shame. The BR has negatively influenced the community.
"'Tis better to be silent and be thought a fool, than to speak and remove all doubt."-Abraham Lincoln
I'm sure they'll release it as DLC after awhile. But I hope not, so it's a little more exclusive.
I think the maps will be pre-loaded into the matchmaking disc. That eliminates the need for codes.