TUAW's Erica Sadun shows evidence of additional hardware support built into the iPhone's Mac OS X software. Amongst the "platforms" listed include the iPhone itself (M68), the iPod Touch (N45) and an unknown identifier N82
Platforms = (M68, N82, simulator);
Platforms = (N45);
Sadun also suggests that she has heard that the iPhone SDK may be delayed, though practically dismisses her own comments as a "rumor".
TUAW has traditionally not been a reliable source of rumors and are quick to wash their hands of their rumor reports by calling all rumors "unreliable". This is posted for interest only, but without the confidence of the original rumor reporter, it's difficult to take these reports too seriously.