Referred to as the 'Great Anvils' by UNSC personnel deployed to the southwestern peninsula of Requiem's smallest continent, these massive sentinels tower high above the shield world's warm tropical ocean. The geologic data acquired from these islands has offered incredible fodder for Infinity Science's Forge group, providing diverse and modifiable terrain for the War Games combat simulations.
The Forge Island also includes a suite of new Forge pieces for your creative pleasures. And yes, a copy of Hang 'Em High can be recreated using the new tools at your disposal.
The new map can only be downloaded via the Xbox LIVE Marketplace right now; it hasn't yet been added to the Halo 4 hub at the time of this writing.