Someone needs to call the plumbers at Apple.
The email has since been pulled.
Nuance, the company behind Siri, sent out an email that included a launch date stating: “as you are probably aware, iOS 7 GA (General Availability) will be released on September 10th” and added that Nuance developers should ensure that the speech services for Siri work properly with the update before then.
The news of the email first appeared on Martin Pittenauers Twitter account that linked to a screenshot of the email.
Historically the iOS update is usually released on iPhone day, with the Gold Master being made available a few hours later; and as Owen points out, it could also be their "one more thing" this year as well, making it available to consumers, as well as developers on the same day.
The email which could also be viewed directly on Nuances server has since been pulled.
Source: Owened | Image: Michael Pittenauer on Twitter