"The Blastacular map pack was originally slated to include three maps; two remakes and one original map. The map pack's original release date was to be set later in 2007, but Bungie's release date for the Halo 3 Beta ultimately forced Certain Affinity to scale back the map pack to ensure it could release before the Halo 3 Beta and not clash. As a result, the original map design was cut, a decision said by Max Hoberman to be one made for the wrong reasons, as the cut map had potential and was turning out well. The cut map would have been asymmetric and very similar to Zanzibar, focusing on one-flag CTF and other similar gamemodes with lots of dynamic elements, with a major element being a light bridge that could be turned on and off."
I think Max Hoberman knows multiplayer really well, and the extra map would be nice for Halo 2.