Without much warning, Bungie has renamed Halo 3: Recon. It is now known as Halo 3: ODST. The reason?
"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... 'ODST' (literally pronounced 'Oh-Dee-Ess-Tee' and not 'ohdst') is the acronym for 'Orbital Drop Shock Trooper.' This special forces branch of the UNSC military force is called into action for highly specialized, small scale operations.
If you're worried about the status of the previously promised Recon armor, which will be unlockable in the game... "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)."