This information was revealed by Apple in a teaser on their official press event invite which showed number 12 (representing 12 September, the releasing date) and the number 5 shown in the place of shadow of number 12 – an indication of iPhone 5.
The Iphone 5 is expected to be launched with iOS 6, a taller display with the same width as the current Iphones and NFC.
The event will take place in San Francisco.
Just to run down all the iPhone 5 specifications, based on rumors and speculations, head your pointer to this URL.
Source: GSMArena, Phonearena