iOS 7

Apple previews iOS 7 during WWDC 2013 Keynote with major UI redesigns in addition to under the hood improvements.

The first developer beta of iOS 7 should be available for iPhone today. Currently Apple Developer Website is not responding possibly due to iOS 7 Beta demand.

iOS 7 developer beta for iPad is coming in a few weeks.

General release of iOS 7 is slated for Fall 2013.

Apple iOS 7 Preview