Finally we get the big thumbs up. The teaser trailer we all saw a few weeks ago has now been given a purpose. The game is Halo 3: Recon. It follows the ODSTs as they attempt to stem the Covenant invasion at New Mombasa. Sounds familiar. Told you I knew what I was talking about. Hit the jump for the official description. Here is the newly released debut trailer from the TGS08 early this morning.

• 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 Chief’s 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 gameplay 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, screenshots, Campaign Scoring, and four-player co-op. All of the new multiplayer maps fully support the Forge editor, offering endless gameplay customization possibilities.