USB device files in the recently release TUAW.
Specifically, there are declarations buried in the iOS system files that reference "iPad3,1" and "iPad3,2." Likewise, "iPhone4,1" and "iPhone4,2." The 5 will be a 4th generation unit because the was technically 1st generation. This throws off the numbering and confuses everyone, so don’t fret if you were confused.
Interestingly, there was no mention of a new which seems strange considering the device usually ships in September. Perhaps is planning to push back their entire launch schedule and announce the iPhone in September instead of the .