Ahead of next week's September 16th's iOS 9 public release, Apple has seeded the iOS 9 Golden Master seed. This release, baring any unforeseen circumstances, will contain the same code that ships to customers next week.
Apple also took the time to release the first public beta of iOS 9.1. Reports have stated that the newly announced iPad Pro will come with iOS 9.1 once it ships in November.
Both iOS 9 GM and iOS 9.1 beta 1 are now available for download via Apple's Developer Center.