iOS 9 is said to have an additional feature of arranging icons in the style of Apple Watch
According to PhoneArena, this video clip was shared by a designer called Ralph Theodory on YouTube.
If this "leaked" information is correct, iOS 9 will not change too much the design interface, but mainly is Apple to improve new features such as siri enhancements, support for arranging icons according to Apple Watch style, music application can automatically identify the language of the song and divide it into lists corresponding to the language, allowing creating virtual buttons on the screen and customize them, .
Currently, iOS 8.1.1 is the latest version of Apple, which was introduced by Apple at the Worldwide Developers Conference (WWDC 2014) in early June. Most likely, iOS 9 version will also be released during WWDC 2015 event.
You can see the video clip about iOS 9 below: