Noble Map Pack Trailer
Self explanatory.
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Zealot is a small, symmetrical map used primarily for Slayer gametypes. Blue and Red teams spawn opposite each other and have sight lines from the spawn points to hit the other team. Grenades create massive chaos on the map, so Armor Lock rules with some people choosing Jet Pack as well. Active Camo and Sprint pair well with Sword on this map, but it's pretty difficult to avoid grenades and stay alive long enough to have a sustained Sword Spree.
Spire is a very large, asymmetrical map used primarily for Invasion. Map details below are customized for classic Invasion, Invasion Slayer has some different nuances but the geometry stays the same. In classic Invasion, Spartans try to capture one of two generators in Phase 1, one of two control rooms on Phase 2, and then the core in Phase 3. Elites win if they stop the Spartans in time at any given Phase.
Countdown is one of the new maps that wasn't in the Beta, click below images for huge. It's a small, symmetrical, 3-level map that we've seen mainly in Team Slayer. The interior houses the power weapons and all the air lifts. Location names below are the "official" location names that will appear in your HUD. All floors are labeled along the walls as well as on your HUD.
Paradiso is one of the new maps that wasn't in the Beta, click below images for huge. It's a large, symmetrical map that we've seen in Invasion Slayer.

Boardwalk is one of the new maps that wasn't in the Beta, click below images for huge. It's an asymmetrical map that we've seen in Territories.
Showing another Forged map, this a multi-bomb versus game. The Cage is the historical predecessor to Lockout/Blackout.
I get that this is supposed to be an example of what you can do in Forge 2.0, but did these guys make ANY new maps?
Powerhouse is an asymmetrical outdoor map that shows up in all the 4v4 and FFA gametypes. It hosts Slayer, CTF, Stockpile, Oddball, Headhunter, Crazy King, and Territories. It has several power weapons, so controlling those will tend to tilt the board in your favor. These are the things you should know (click for huge):
I get on a plane to Japan in 12 hours which means, sadly, that I've likely logged my last game of the Halo Reach Beta. Hopefully they extend it so that I can get my Warrant Officer Grade 3 stripes and my shiny new helmet. I leave you with some tidbits.
[Updated 12/6/10: This is no longer true in the production release.] After Phase 1, several weapons caches become available. Directly to either side of the first pair of generators are Covenant weapon caches. Each one holds a Plasma Launcher (n00b tube) and Focus Rifle (laser gun). These pictures show the caches along with paths from each generator. Click for huge.
This gametype actually isn't all that deep, but it is challenging because it's 3v3 with 3 generators to defend. At the beginning there are random weapon drops that fall from the sky with power weapons. Rocket Launcher, Sniper Rifle and Spartan Laser are all available. You will want to grab these because all of them can do massive damage to the generators.
Spartans
Overlook is the map that Network Test 1 (a.k.a. Generator Defense) is played on, the playlist that went live yesterday morning. It is a medium sized, asymmetrical, outdoor map that pits Spartans against Elites. Click for huge:
Sword Base is one of the two maps currently available in the Beta. Here is a picture illustrating a number of the important items (click for huge):