The latest beta of iOS 7 is now available for developers. This first beta released only a short time ago only supported the iPhone and iPod. This second beta adds support for the Apple iPad. A final release is expected in the fall and it is expected that iOS 7 will also work on the iPhone 4, 4S, and 5, as well as the fifth-gen iPod touch, and iPad 2, fourth-gen iPad, and iPad mini.
Apple is scheduled to release iOS 7 this fall for iPhone 4 and up, iPad 2 and later, the iPad mini, and the fifth-generation iPod touch. If history is any indication, its release will also coincide with the launch of a new iPhone. — PC Magazine