Apple might be planning to launch its iOS 9 at the WWDC this June. This also indicates that the launch would 4 months before the speculated launch of Windows 10 this October. Based on the document leak that was released first by myce.com, the preview build would be released during the period much before the 2nd and 3rd quarter of the year.
News sources suggest that Windows would have plans not to release Windows 10 in the month of October like the rest of its products as rumors state that it would be released month of June or July. However there is no confirmation about the speculation of the release dates of both iOS 9 and Windows 10. The June launch of iOS is based on the timeline of Apple as it follows a similar pattern while launching its iOS each year. If Apple will remain loyal to this pattern then we can be sure that the launch of iOS would be followed by the iPhone 6s, iPhone 6c and iPhone 7 launches during this September.
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Based on the report by MacWorld, a latest iPhone (or iPhones) will accompany the launch of iOS that would make it a great team. Later the iPads launch would also happen and they will also be equipped to run on the latest iOS. However, some devoices are also dropped from the compatibility list of iOS 9.