Bungie and Microsoft have announced that the map pack will be available over Xbox Live on March 3rd, a week later than Halo Wars’ release.
However if you’ve got a Limited Collector’s Edition of Ensemble’s Halo Wars earmarked for yourself then the map pack is yours when the game arrives. Mythic adds three new maps.
Sandbox
”…combines large-scale vehicular combat with a limitless amount of Forge customization. Boasting a tiered, open-world layout, build your own unique game experiences using the Forge map editor. Sandbox is a map unlike any Bungie has ever created.”
Assembly
”…is set in the heart of a Covenant Scarab manufacturing facility. With two identical bases on either side of this medium-sized map, it’s a perfect environment for both Slayer and objective games like Capture the Flag and Assault.”
Orbital
”…a small asymmetrical map, is set in the docking station of the Quito Space Tether. One-sided games like One Flag, and One Bomb are sure to become quick fan-favorites, but the Slayer faithful will also find plenty of action on this battleground.”
Source: VideoGamer.com
