We all know about the impending announcement of the iPhone 5S and 5C, the rumored date and even the colors that it’ll be available in but we still didn’t have a real confirmation from Apple that it’s actually happening. Nuance – the company behind Siri – sent out this email earlier today to developers in their voice recognition program telling them that “as you are probably aware, iOS 7 GA (General Availability) will be released on September 10th” and that they should ensure their applications work properly with the new bits before then. Considering Nuance’s intimate involvement with Apple in the past this is as real as it gets outside of Apple itself inviting the media to the event. Of course, there’s a chance that Nuance has no idea and is just hedging their bets that the leaks are right but given their proximity to Apple I wouldn’t be surprised if they did know the date.