Your friend Mathieulh declines to decrypt anything 3.60+, anyway... from what I know you can't read PPC Assembly yet, so the EBOOT would be of no use to you. Other than that, I'm sure someone like Team-Duplex will release a unencrypted .self of the game shortly after its release. Not that I can be bothered any more...

I've had a quick look at the FastFiles and I can say IW's method is a lot more efficient than what Treyarch done. It also means no more 'mods'. Which to be honest I'm quite happy about.