Halo 3 Announcement Feb 9th

[Crash]

Originally Posted by DarkMaster

You know its certainly possible that they could be releasing some kind of downloadable campaign continuation.

no, they already said they wouldn't... check bungie.net

Elite Operative asks: Will there be downloadable updates and maps? Will there be new Campaign stuff?

Yes. We have not announced a schedule yet, but we will be making new downloadable multiplayer maps. They rock too. I've played a couple. There will likely never be downloadable Campaign content, however.