Well considering the Xenon isn't done, the game can't have been fully Betad for it. So its in testing on a Beta Testing Machine - so its probably nearing Beta just as Xenon nears completion.
Haha. If you can't be bothered then its obviously not worth you telling us
I wouldn't try and search for proof the Xenon is not called the XBox 360; it would be impossible because as far as I know you're the only one to believe that However, I can show you it is the Xenon: on CNet.