The latest iOS 7 is announced by Apple at Worldwide Developers Conference WWDC 2013 event on Monday, 10 June at Moscone West, San Francisco with new features and new interface. You can check out the compatible iOS 7 devices and iOS 7 availability details in following.
iOS 7 Compatibility Chart
iOS 7 Release Date
iOS 7 beta 1 is released to developers whereas the final release of iOS 7 is expected in this fall with the next iteration of iPhone.