If you’re reading this, you know the iPhone 5 was unveiled today. The device will be released on September 21, and then on September 28 in some additional countries.

iOS 6, which will run on the device, as well as on the iPhone 4S, iPhone 4, iPhone 3GS, New iPad, iPad 2, and iPod Touch, will be released to users on September 19. It’s been available in beta to developers since June, but now Apple has released the final “Golden Master” build (via The Verge).

Apple announced that the iOS 6 GM seed and Xcode 4.5 GM seed with iOS 6 SDK are now available for iOS Developer Program members in the iOS Dev Center.

“It’s time to take your apps in a whole new direction with iOS 6,” says Apple. “Download the SDK today and explore Maps, Facebook integration, Passbook, Reminders, new features with In-App Purchase and Game Center, new camera APIs, and so much more.”

Now developers can really get their apps ready for Apple’s new users and all of those soon-to-be iPhone 5 owners.

More on iOS 6 here. More on the iPhone 5 here. More on today’s Apple event here.