From DailyTech: Apple, Inc. (AAPL) launched iOS 9 for existing devices last Friday (Sept. 16). Now with the launch of the ninth generation flagship iPhone 6S and 6S+ smartphones prepping for a Friday launch, Apple has rolled out its first set of patches for iOS 9, iOS 9.0.1.
It's worth noting this appears to be earliest in its smartphone release cycle that Apple has released a patch. Last year Apple made iOS 8 available for existing devices just two days before the Sept. 19 launch of the iPhone 6 and 6+. A week later it had already released the iOS 8.0.1 set of patches -- which was considered quite an early update at the time.
The first two iPhones were accompanied by iOS version introductions on the same day. But since then it's been more unpredictable as international support demands and the overall size of the userbase have grown (not to mention the complexity and capabilities of the OS itself and the hardware). The availability of iOS 5 for older devices, in fact came a day after the release of the iPhone 4S.
As a general rule of thumb, though, the availability for older devices came two days prior to the release of the new device.
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