It is reported that many iOS engineers has noted a number of website visits about unknown iOS devices which are running iOS7 system. All those indicate that iPhone 5S and iOS7 have completed developed. The IP Add of the detected devices is from Apple headquarter in Cupertino, California. Hence it can be inferred that Apple has been testing iPhone5S and iOS system.

Currently, Apple software developers and application team are under test for iPhone5S and iOS 7 system. The new iPhone device id is "iPhone6,1" while iPhone 5 is "iPhone5,1" or "iPhone5,2". So there is a huge possibility that this new device will be the expecting "iPhone5S" in this summer. Some experts point out that 29th,June is the 6th anniversary of iPhone, so the next generation will most probably be "iPhone6".
iOS7 is a new designed system after the resignation of Scott Forstall, who previously in charge of developing iOS system. Jonathan Ive is in charge of the appearance of this new iOS system. According to the practice, Apple will release developer edition for the latest upgrade of important operating system every June in WWDC conference held in San Francisco.