Jumping the gun?
The more I hear about this, the more convinced I am that a mountain is being made out of a molehill here. All we've had is some vague statements from Sony that the eReader has been refused because of inApp purchasing issues. That's IT. All the rest is supposition, speculation, inference and good old-fashioned making shit up.
Apple requires that it gets 30% of in-App purchases. Just like the apps themselves, this is its charge for providing a service, namely the interface and connectivity to make it work seamlessly and easily, the server storage for the thing being purchased, and the payment processing, none of which are easy or cheap to do. One might quibble over the percentage, but that they are providing a service that it is fair to charge for doesn't seem to be in doubt (though I'm sure many will disagree...)
Amazon has chosen not to go this route, and instead provides a link to their website where people can purchase their ebooks from instead. That means that they do their own storage, their own payment processing, and their own transport mechanisms, off their own back, and the prices for all that are figured into the cost of the ebook. This makes sense for them, because they have to do most that anyway for their non-iphone customers.
The key thing here is that nothing that Amazon is doing is costing Apple a penny, and so Apple has no reason to kick up a fuss. For that matter, all the other ebook readers (there's loads of them out there people, iBooks and Kindle are the johnny-come-latelys) do much the same thing. Apple has never had a problem with them either. Sony could equally well have done it too, but they tried to use Apple's service instead, without paying for it, and got told where to get off. Probably they will now go and use Amazon's method too.
NO ONE connected with this has so much as whispered that Apple is going to clamp down on anyone else, and start banning other means of getting ebooks onto their hardware. All they've said is if you want to use the inApp purchasing framework, you gotta pay the fee. That's it. Everything else has been knee-jerk Apple bashing. There's plenty of things that they've actually done to bash them for, without having to invent stuff because its a slow news day.