UPDATE: Titanfall Expedition DLC is available now on Xbox 360. You can purchase it here for $9.99, or, if you own the Season Pass, visit the in-game store to download it.

Original Story
EA has announced that the first DLC pack for Titanfall, Expedition (for $9.99 or free with Season Pass), will be available alongside the free Game Update Three tomorrow, June 17th on Xbox 360.Patch notes for Game Update Three are available here.

Join us on June 17th for the release of Titanfall: Expedition on Xbox 360! Available now for Xbox One and PC. The Titanfall: Expedition DLC introduces three new maps to the Frontier including Runoff, Swampland and War Games. With this release we will also roll out Game Update #3 as a free download that includes Private Matchmaking updates, Custom Loadout Names, Last Game Summary Improvements and much more for our Xbox 360 community.

SOURCE: Titanfall