Microsoft announced details on the Season Pass-like option for Halo 4 called the War Games Map Pass
The War Games Map Pass
for Halo 4 will give access to three upcoming multiplayer map packs for Halo 4 with each containing three maps.
The Pass will cost $24.99 (which is 15% less if you brought all the DLC). It is released alongside Halo 4 on November 6 and comes with three unique in-game items - the Spartan-IV Scanner and Strider helmets, and the Falcon in-game emblem.
The War Games Map Pass was previously announced as part of the Halo 4 Limited Edition that costs $99.99.
But if you buy the normal edition along with the Map Pass it will cost $85, you are probably better off getting the Limited Edition if you plan on getting any of the multiplayer DLC.