We are already seeing Apple prep for iOS 9 as the new iPhone and iPad update appears in server logs, and in June we expect to see iOS 9 announced at Apple's WWDC 2015 event. With a iPhone 6s release likely in the fall we could see Apple go big with software and features like the company did with iOS 7 and the iPhone 5s.
Expect a developer iOS 9 beta in June and a public iOS 9 release in the fall, possibly in September. Odds are very good that there will be no iOS 9 support for the iPhone 4s and we may finally see the iPad 2 and iPad mini drop off of support as well.
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