Apple won't be releasing iOS 7 to the public until Wednesday of this week, but it's already believed to be widely testing multiple versions of future updates. This according to the web analytics of iDB and other websites.
The web logs show that sites starting receiving hits from devices running everything from iOS 7.0.1 to iOS 7.1 back in August, with traffic increasing in early September. And all of the activity is coming from Cupertino...