According to various reports and photo evidence over on the Xbox.com forums, new Halo 3 Xbox 360 consoles with lot numbers #734 have been confirmed to have the newly new 65nm CPUs in them. So, if the Halo 3 360s are a predictor of things to come, hopefully we'll be seeing 65nm technology in all Xbox 360s hitting store shelves soon. Lots more information and a guide to tell if your Xbox 360 has Falcon technology can be read over on the Xbox.com forums via the links below. You're free now ... fly Falcon, fly!
Read - Falcon discovery thread
Read - How to tell if you have a Falcon 360