If we have to believe the internet then iOS 7 is releasing tomorrow (18th September, 2013) for iPhone 4, iPhone 4S, iPhone 5. It will also head to the iPad mini, the second-, third-, and fourth-generation iPads, and fifth-generation iPod touch on the same day.
At the mean time other sources also tell that the iOS 7.1 development is already in progress. According to 9To5Mac apple is already testing the iOS 7.0.1, iOS7.0.2 also.
The report suggested that while iOS 7.0.1 and 7.0.2 could bring successive bug fix updates, the iOS 7.1 could be meant for introducing new functionality or support for new hardware, such as the iPad 5, which Apple is expected to release later this year. The web analytics also showed that all the iOS 7.1 tests have been conducted on iPads.