Is that really so urgent? The majority of the people using iOS 7 are developers, understand apps will be buggy under it and wouldn't leave a bad review. I'm sure an extra few hours wait won't make too much difference :)
Stories of unjustified bad reviews being left by users like these due to poor behavior on iOS 7 are really common in the community.
After all, they do warn you that you should never install a beta OS on your daily use device and they are for development purposes only.
At the same time, I do feel sorry for devs getting bad reviews because of compatibility issues. I haven't had any myself, but it's probably only a matter of time.
I know of some affluent high-schoolers who seem to consider it prestigious if you can show off a prerelease iOS on your phone.