Halo 4's Crimson Map Pack is now available to download, adding three new maps and expanded access to multiplayer mode Extraction. It costs 800 MP.
"Venture into the large, vehicle-focused human environs of Harvest, explore a human foray on an alien moon in Shatter, and witness the chaos of a clash of civilizations in Wreckage, with its blend of claustrophobic spaces and dangerous exposures," the blurb suggests.
You can read more about the specifics of each map here, care of Halo Waypoint overlord Jessica Shea. They look and sound rather memorable.
Achievements for the pack have also been revealed - I've reposted them below. Big ups to whoever manages to nab all three Mancannon-related Gamerscore hauls first.
Now They Fly? - Get a kill while airborne in a Warthog. - 50 points
Size Is Everything - Kill 20 enemies with a detached Machine Gun Turret. - 20 points
ODST - Kill a player while you're airborne from using a Man Cannon. - 30 points
Bigfoot - Kill 20 enemies using the Mantis' stomp attack. - 20 points
David and Goliath - Board an enemy Mantis. - 20 points
Clay Pigeon - Shoot an enemy out of the air while they use the Man Cannon. - 40 points
Special Delivery - Kill an enemy with a melee attack when landing from a Man Cannon. - 30 points
Pump Yer Brakes - Score the killing blow on a Mantis. - 40 points
Are you buying? Download here, then. We'll see you on the battlefield, I expect.
If you own the Halo 4 War Games Pass, your own pre-purchased download should materialise shortly. Microsoft's Major Nelson has recommended that pass holders follow @HaloWaypoint for more intel.
UPDATE: Seems there's trouble afoot on the technology front. "We are aware of the issue in which Map Pass and LE owners are not being recognized to download the Crimson Map Pack at no additional cost," 343 has tweeted, adding "we are working on the situation now and will provide an update as soon as we have one. We apologize for the inconvenience."