“This is our best iPhone launch yet―more than nine million new iPhones sold―a new record for first weekend sales,” said Tim Cook, Apple’s CEO. “The demand for the new iPhones has been incredible, and while we’ve sold out of our initial supply of iPhone 5s, stores continue to receive new iPhone shipments regularly. We appreciate everyone’s patience and are working hard to build enough new iPhones for everyone.”
There may this year have been two phones launching simultaneously for the first time in Apple's history, but this years opening weekend sales is a full 4 million higher than last years iPhone 5. As Tim Cook has confirmed in the press release, the initial supply has sold out – in many locations before the stores even opened – but Apple will be will working hard to get those stocks replenished.