27th of February 2009 with halo wars release
you have to buy halo wars which came out yesterday march 3rd
its going to come out with halo:ODST
It has already come out but to get it you need to get HaloWars game to get it
they come out with the halo 3 O.D.S.T game
look at my file share and watch my vids for all locations . my name is darksonic200
muythic map pack. that comes with HALO 3: ODST
its out now for 600 microsoft points
Mythic map pack mythic mature pack
if you buy the halo wars LCE you get a code for the new mythic map pack on Halo 3
A genuine code for a copy of the Horizon Map Pack for Halo 4 is available to you upon purchase of the map pack card from a store, such as Target, or you can purchase the map pack directly on Xbox Live via the Store on the Halo 4 main menu.
cant download halo 3 map pack, error message : premium is blocked
It will have a different campaign mode and all of the halo 3 maps but it will also come with both halfs of the Mythic Map Pack (Assembly, Orbital, Sandbox, Citadel, Heretic, Longshore).