The OS leads to a lot of the form factor decisions, i.e. the dock connector, no USB/SD cards. Apple never used them on any iPod and there's no reason to see that changing any time soon. Also, it's not really correct to look at this as a big iPod Touch or iPhone, those are scaled down versions of the iPad. The iPad was in development and they took the tech and branched it into the iPhone and made it available quickly and let people get used to the interface. The iPad is basically Apple saying that they got it right with the iPhone/iPod Touch and they don't have any reason to change the OS when something else uses the same multitouch interface.
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