Jason, I think this is still an open issue, as was pointed out in the comments under your Techcrunch article. There is also another possibility - that Apple ju

Jason, I think this is still an open issue, as was pointed out in the comments under your Techcrunch article. There is also another possibility - that Apple just didn't like that in the new Sony app, you could buy ebooks directly, while other apps (like Kindle app, but also some others) fire up browser. And this technique Apple did NOT banned (yet).