Mine expired promptly at 8:00 PM. So nice of Apple to warn me ahead of time that it would be expiring today at 8:00 PM. Fortunately, I had another iPhone in the car (still on 3.1.3) that I switched to until I got home to download the update.
The GM came out a week ago. An e-mail was sent to developers. You should have updated by now. Don't try to act like they did something sneaky that you weren't aware of.