Major frustration here, too. My cheek just hung up on a callback from my doctor.
So, I called Apple to vent. Tech Support has been told to tell us that the fix will be the end of the month. I'm going back to the Apple Store to exchange it again, hoping for one that works.
I asked if the Beta had the fix and he said that all it had was software for developers and no proximity sensor fix was included in their version. He said that the proximity sensor fix was being tested and they were working around the clock. I volunteered to test their fix and was refused.
No flaming, please, I don't make the news, I just report it.
Well I never put my faith in what Apple stores/tech support says. Its been said here many times they don't really know anything more than we do.