iOS 9 is the upcoming ninth release of the iOS mobile operating system, designed by Apple Inc. as the successor to iOS 8. Unveiled at the WWDC on June 8, 2015,[Citation needed] it is scheduled to be released in fall of 2015. Billed as "a better experience with every touch", iOS 9 focuses less on new features and more on under-the-hood optimizations as well as battery improvements, unlike its predecessor, which focused mainly on new features and user interface optimizations.