Server logs report new iPhone 2,1?
According to Mac Rumors, developers have started to notice a new iPhone popping up in their server logs: 2,1.
Apple uses these models numbers to distinguish between different hardware models. The original iPhone carries the model number of "iPhone 1,1" while the 3G iPhone is labeled "iPhone 1,2". These numbers do not change for simple storage increases and instead represent functionally different devices. Similarly, the iPod Touch was originally introduced as the "iPod 1,1" and the most recent hardware revision was labeled "iPod2,1". The 2,1 iPod Touch added a speaker, volume controls, microphone support and a much faster processor than the 1st generation model. This new model number can be found in the USBDeviceConfiguration.plist in an unencrypted firmware.
Not that I doubt Apple's working on a new iPhone, but wouldn't they be smart enough not to browse on it on external sites while reporting itself as one?
Next Generation iPhone Model Revealed in Firmware [Mac Rumors]

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Everyone knows they are continually revising their products. So now it's confirmed. Who cares? What's changed as a result of that knowledge? The rumor mill can kick into high gear now?
It's not that hard to spoof these things though.
I echo Vamidus; Perhaps someone is spoofing.
Also possible that they have iterated the version number due to a major revision of Safari or other software. Perhaps the next major software update will be significant enough to justify the change.
...wouldn't they be smart enough not to browse on it on external sites...
Or alternatively, know how to launch a minimalistic PR campaign.