Occam's razor doesn't apply the same to the hardware equation.<p>If the architecture is ARM, it would mean that Apple bought PA Semi for the purpose of getting them to dump their main architecture, which was the whole reason they were created, and got them to switch over to ARM and develop, fabricate, and test the chip in the span of a about a year.<p>I'll place my bets on Power architecture + ARM emulation/JIT/whatever or iPhone App recompile for the iPad.