The latest 2.2.1 firmware has an iPhone product model 2,1 hidden deep inside the metadata. Apple uses these numbers to differentiate different hardware versions. So, this hints at a new version of the iPhone as the model of current 3G version is just 1,2. This new model number can be located in USBDeviceConfiguration.plist of a decrypted firmware.
Another proof of the above is that a developer from PinchMedia have also pointed towards web hits from this new model number based on server reports.
Now, this could very well be a typo by some Apple software expert but for now, it seems to be quite truthful.