iOS 7 is in beta at the moment but this will all change tomorrow when Apple announces its release date for the public to install, for some this new operating system worked from the ground up will shock a few at first because it is completely different to what users are used to with iOS 6. There were rumors iOS 7 beta 7 was going to release in August, but now it seems a public release is going to be next after the September 10th Apple event.
Apple's going to announce the release date tomorrow. The email you're talking about was probably talking about the Gold Master and had that been released then yes, there'd be a chance for public release tomorrow. since it hasn't, iOS 7 won't be released tomorrow.
Last time I updated to iOS6 right when it was released and it knocked off all my devices from having wi-fi access. I'm going to wait a few days this time around. I hope it's cool!
