I'm glad I woke at 2:30 this morning here in the east coast. Nabbed two 5s' by 3:04 and tried to go back to sleep.
Interestingly, I first tried through Verizon's site and they started selling around 2:55 eastern. I gave up though because their ship date said 9/26 right off the bat.
Siri is definitely improved, I agree with Mossberg. I have the leaked GM copy on my ipad and Siri has had no delays, and she/it handles tasks and requests with ease. Siri may become my favorite feature of ios 7...and this coming from someone who had given up on Siri!