There was an issue where the up to date program was released early for some people. Apple have said people who got the code early will be issued a new one after ML is officially released.
Cool, thanks for the tip. Where did they say this?
I also did the Up-to-Date thing and the password protected code they gave me says it was used. Spoke with Apple Support and they claimed "several customers codes were sent in error and you should receive a new code within 30min".
I hate to say it, but phone support and a bunch of hoop jumping just to get OS validation makes me feel like I'm back on Windows.
Edit: It's been 30min and i got nothing new so I have no idea whats going on.