According to report from some developers, they have found logs of iOS 7 and the next generation Apple iPhone. The logs found from device identification reference in developer server.
A developer showed The Next Web the presence of iPhone 6.1 running iOS 7. It’s different from iPhone 5 that uses name iPhone 5.1 and iPhone 5.2 as reference name (depends on model).
The used IP address is from Apple office in Cupertion. It means that Apple developers is testing compability of iOS 7 with available apps on App Store.
Apple is predicted has started the development of iOS 7 in late 2012. Most likely iOS 7 will be released for developers at WWDC event held in June 2013 in San Francisco, USA.