Apple announced that it would be releasing iOS 7 to the public on September 18th at its iPhone Keynote today and unsurprisingly has released the GM build of iOS 7 to developers today. The GM, otherwise known as Golden Master, should be the final firmware version that ships to the public on the 18th.
In fact, as long as no other issues are detected, developers who update to the GM firmware won’t be prompt to update when it is officially released.
According to out initial investigations we can conclude that there are new sounds present in iOS 7 GM along with 34 new Apple wallpapers. Then new sounds include ringtones and alerts, along with the unlock, charge and Siri mic sounds being altered.
If you are a developer you can update to iOS 7 GM
over-the-air (OTA) or by downloading the firmware directly from the iOS Dev Center.
Update #1: There is no OTA update for iOS 7 GM.