A couple of weeks ago iMore reported that Apple would be holding their iPhone 5 event on September 12, 2012. We've since learned that iPhone 5 pre-orders are currently planned to begin that same day, at least in the U.S. Release is still planned for 9 days later, on September 21, 2012. We've also learned that the second wave of iPhone launches, the ones in international markets, will begin in the first week of October, likely October 5.
Last year Apple made pre-orders for the iPhone 4S available 3 days after announcing the new smartphone.
Earlier today another report said AT&T is planning for a launch of the device in late September.