Quote Originally Posted by GameSpy
Bungie announced today that it is changing the name of Halo 3: Recon to Halo 3: ODST. The upcoming chapter in the Halo franchise focuses firmly on a set of characters known as ODST (Orbital Drop Shock Troopers) who are on a mission which sees them drop into the ruined city of New Mombasa. The team is on assignment to uncover clues that relate to the Covenant's brutal attack on the city.
Quote Originally Posted by GameInformer
Bungie.net just shared that Halo 3: Recon has undergone a name change. Now, the stand-alone expansion to the Halo 3 universe will be known as Halo 3: ODST. Bungie staff explained the name change, saying that it is a more straightforward representation of what to expect come release day.



“If you recall, this is our recently announced stand-alone extension to Halo 3 that features an all new campaign played from the perspective of an ODST in the heart of a Covenant occupied New Mombasa. In addition to sleuthing around the city and piecing together the details surrounding your squad's whereabouts, the game will also include some new Halo 3 multiplayer content as well as one or two unrevealed surprises when it's released next Fall.”

“This new title is a more straightforward account of the experience that awaits and the role you will assume as you explore the streets of New Mombasa. But don't worry, you can still has Recon. (the armor that is, it's still tied to the Vidmaster achievements and will be accessible via the final retail release next Fall).”

Halo 3: ODST is expected to hit retail fall of 2009.
Thought maybe a few Halo fans would be interested in this...