Citadel

Looking for the Citadel, the Forerunner building, or the Covenant Citadel featured in Halo Wars?

Citadel is an upcoming Halo 3 map that will be included in a map pack released in early 2009 along with Longshore, and Heretic. “Winter,” as they say." - Lukems in the 10/10/08 weekly update. It may also, with Heretic and Longshore, come out with Halo 3: ODST, as Bungie said there are going to be new multiplayer maps released along with it.

Skull
This map has a skull for the multiplayer achievements. When found it unlocks the achievement, Citadel Skull. It has an image on the skull that resembles the Citadel in the Campaign level, The Covenant.

Trivia

 * This map is rumored to be a Forerunner map because of the Forerunner symbol on the Citadel Skull achievement.
 * This map could be based on the end of the level The Covenant as where Truth, attempted to activate the Halos because it's called "The Citadel", but may be a re-modeled "Citadel" instead.
 * It is possible this map will not ship with the Mythic Map Pack in February.
 * This may also be another map similar to Construct, but due to the Shotgun Spree achievement, it may be more of a close-quarters map.