KGI Securities analyst Ming-Chi Kuo said the low-cost iPhone would ship in early September. Kuo has an excellent track record.
Jim Dalrymple from The Loop have put an end to the rumours with a simple "Nope."
Although Jim didn't give a reason it is clear why it will not be released on 6 September. 6 September is a Friday which means the prediction is that the iPhone will go on sale on the 6 September which means Apple would have to make the announcement on 27 August. This is unlikely due to the ongoing testing of iOS 7.
Cult of Mac original predicted 20 September would be the release date based on previous iOS beta releases. Accourding to their prediction everything has gone accourding to plan with the exception of last week when Apple's developer website went down and is slowly coming back online.
If the iPhone goes on sale on the 20 September it would mean Apple would make the announcement on the 10 September. This would be more inline with last years release of the iPhone 5 which was announced on the 12 September and went on sale on the 21 September.