Moonlight Sonata (Level)

In a recent Bungie Weekly Update, it has been stated that the map Purple Reign has been delayed and will not feature in the new DLC, but will be replaced by a new map entitled "Moonlight Sonata." This does not, however, mean that the map Purple Reign has been scrapped, only that it will appear in a later set. Moonlight Sonata will likely be available for download on Xbox Live Marketplace in the map pack available Spring 2008. this map is also known as moonbase alpha

Speculation
On the image for the Bungie Weekly Update 02/01/08 there is a screenshot of the Halo 2 multiplayer map Tombstone. This may suggest that Moonlight Sonata is a remake of Tombstone or Hang 'Em High.