Also know that if you are not under a developer account, you will evenutally get a notification that your phone can't connect and you need to enter a dev account... it may take a week or so but you will eventually get this message.
isnt that after the beta expires? I had all 3 ios6 betas with no dev account or UDID registration. I always updated before the expiration date though. ios7 beta 2 expires like 7/24 i think.