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BTW, if you have a Kindle there's already an unofficial Guide to iOS 7 available. Here's a description:
"iOS 7 will be launching during the fall of 2013 and we recently got to see a preview of what is to come at this year’s World Wide Developer Conference. Apple has made a massive change in it’s design aesthetic with iOS 7, it departs completely from the design you are currently familiar with in iOS 6 yet at the same time it is immediately familiar. You will be surprised at how comfortable you are using the new interfaces even though at first glance they seem world’s apart. Let’s get right to by starting with an overview of where iOS stands at this moment."