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We believe that there is no too much changes in iPhone 5S but it doesn't mean nothing. Some rumors here which you may want to see http://blog.macblurayplayer.com/five-great-expectations-for-apple-event-in-september/
I’m not expecting major changes. Fingerprint scanning seems to be a strong possibility, based on the number of times I’ve seen it pop up in “insider” articles. Other than that, I expect a significant amount of minor changes, new icons, spiffy animations and beefed up hardware specs. I’d like to be surprised by something big, though...it’s been awhile since Apple really amazed me with iOS.