From the hands-on:
"Map packs are the life blood of an online shooter. With the emergence of user-created content, much championed by Bungie in this generation with their impressive forge maps and forge world, the best creations can often come from the community. This time however, it’s the pros turn, as the developers bring out the Noble map pack, the first pack of three new maps to extend your play area in Halo: Reach.
Firstly, these maps are absolutely beautiful. Every one has it’s own style and unique location that is filled with interesting details and a whopping vista to distract you from the killing. They range from a small map in Anchor 9 through a medium to large map in Tempest to a Battlefield: Bad Company challenging behemoth in Breakout."