Here are the first leaks of upcoming Apple iPhone 5S. These leaks were posted on a blog on Chinese website Zol.com.cn and are allegedly taken from a Foxconn plant. These images look quite good but are not very detailed.

From these leaked images, you can get both front and rear view of the upcoming iPhone 5S thus make a rough idea of the Apple iPhone 5S. Looks as if there isn't any major change with the Apple's existing design. The same design is likely to continue with the iPhone 5S.
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Images Source - sjbbs.zol.com