It is official even though rumors had predicted the date of the event. On September 10, the Apple event will be held in California at directly at the Cupertino headquarters. In all likelihood Apple will unveil a new ( or new ) iPhone, iOS7 and probably a new Apple Tv.
Several "stolen" images of the new devices that Apple is expected to unveil have been leaked on the net: one with a plastic body that should be called iPhone 5C and the other that everyone thinks will be called iPhone 5S ( natuaral upgrade of the current device ). The latter smartphone is expected to be available in two unreleased colors: Champagne and Graphite. The plastic iPhone, on the other hand, will have different colors, and the Apple event poster might just be inspired by this.