According to developer logs The Next Web  has seen, Apple is testing a device with a new, "iPhone 6.1" identifier running iOS 7. Furthermore, the device was sending requests from an IP address on Apple's Cupertino campus.
Even if the developer logs are genuine, they don't bring us any specifics about the new device or the software it's running.
Still, it's possible that the next generation iPhone is already undergoing testing at Apple, even though it's not likely to be launched before fall 2013. For comparison, a prototype  of the iPhone 4 -- very similar to the final version -- was unearthed several months before the phone was actually launched in June 2010.
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January 2, 2013