The following is quoted from Xbox.com.

To the delight of devoted fans across the world, at the Tokyo Game Show Microsoft debuted Halo 3: Recon, developed exclusively for Xbox 360® by acclaimed developer Bungie. This new chapter in the Halo saga lets you experience events leading up to the epic story told in Halo 3 through the eyes of a new hero in the Halo universe.

The stand-alone expansion, set to release in fall 2009, extends the award-winning Halo® 3 experience with hours of new campaign excursions and multiplayer game play. In addition, attendees were given an all-new glimpse of the Xbox 360 exclusive strategy game Halo Wars from Ensemble Studios. The campaign mode provided a thrilling taste of the revolutionary game play and new perspective of the Halo universe. Enjoy the full experience when Halo Wars hits retailers in early 2009.

Game Details

This new chapter in the Halo universe includes the following:

* All-new campaign content: The Halo 3: Recon campaign is an intriguing side story that takes place during the terrifying events leading up to the Master Chiefs return to New Mombasa in Halo 3. Experience the fate of Earth from the brand-new perspective of a special forces ODST (Orbital Drop Shock Trooper), adding a unique outlook and new game play elements to the events that unfold in the trilogy's finale. While the feel of this new chapter greatly resembles that of previous Halo experiences, Halo 3: Recon will require you to employ more elements of stealth and cunning than ever before.

* Prepare to drop: Known for their courage, valor and, at times, insanity, ODSTs are among the fiercest UNSC soldiers, priding themselves on being the first unit deployed into hostile situations. While not as large or supernaturally gifted as their Spartan comrades, these "Hell Jumpers" more than compensate with their ferocious attitudes and unwavering nerve.

* Expanded multiplayer collection:No Halo experience would be complete without groundbreaking multiplayer content, and Halo 3: Recon gives fans more of what they love. With exclusive new maps and expanded Forge options, Xbox LIVE® Gold members will find more multiplayer content than ever before with Halo 3: Recon.

* Ever-growing community options: Enjoy all the great Halo 3 technological innovations, including Saved Films, screen shots, Campaign Scoring, and four-player co-op. All of the new multiplayer maps fully support the Forge editor, offering endless game play customization possibilities. (less info)