We've independently heard that Apple has plans to begin selling the next-generation iPhone on Friday, October 7th; the date first reported by TiPB. According to our sources, Apple has been weighing between launching the new iPhone on October 7th or October 14th, but with the product's latest stages of pre-mass-production currently moving along nicely, Apple is presently shooting towards a launch on the 7th. On top of this, unlike with the iPad 2, Apple plans to offer pre-orders for the new iPhone.
Pre-orders are said to begin at the end of September. Apple is reportedly debating Thursday, September 29th or Friday, September 30th with the 30th seeming a bit more likely.
This information would seem to support a September event despite reports to the contrary.