AllThingsD are reporting that they have inside information that Apple will reveal their next iPhone on September 10th and in they past they have usually been right.
Chances are that we will also see the full consumer release of iOS7 too, and also a new line of lower cost lower specification iPhones. Apple has been making money but it has also seen a large drops in users to other platforms such as Android and Windows Phone.
Companies like Nokia specifically should be worried about these new lower cost devices as that is an area that Nokia is seeing huge sales in and a new low cost iPhone would seriously hurt them.
This is all still rumor but on our scale we would rate this as an 8 in probability that September 10th is the date.