Apple iOS 9, codenamed Monarch, will be available to the world on September 16th. iOS 9 boasts of various improved features like battery optimization, several built-in apps and enhanced security for all the devices. The operating system comes as a free update for all users of iPhone 4s and later, iPod touch 5th generation and above, iPad 2 and above and iPad mini and later. The all new Proactive feature will offer contextual users suggestions based on their habits, location, or time of day.
Source: https://thehackernews.com/2015/09/apple-io9-security.html