With E3, comes news on just about every angle.  One of Microsoft's big guns will certainly be Halo 3 ODST.

The cover art was recently released, and the game is now available for pre-order at Amazon.  The official release date has not been announce yet, but it is confirmed for holiday 2009.

Check it out: Halo 3: ODST

Amazon.com Product Description
Developed exclusively for Xbox 360 by developer Bungie, Halo 3: Recon is a stand-alone expansion that extends the Halo 3 experience with hours of new campaign and multiplayer gameplay*.

The new campaign chapter predates the events that unfold in Halo 3 and gives players a new perspective through the eyes of a new hero in the Halo universe. New multiplayer maps ensure that the Xbox LIVE experience of Halo 3 continues to thrive.

* Xbox LIVE Gold account required for online multiplayer gameplay

Features:

• All-new campaign content: The Halo 3: Recon campaign is a side story that takes place during the 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 will greatly resemble that of previous Halo experiences, Halo 3: Recon will require players to employ more elements of stealth and cunning than ever before.

• A new hero: 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 multiplayer content.  With exclusive new maps and expanded Forge options, players will find more multiplayer content than ever before with Halo 3: Recon.
  
  
• Ever-growing community options: Players will continue to enjoy all the 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 for fans.