In this leaked picture, it shows an iPhone 5s in Gold or Champagne color. Beside this purported Gold or Champagne iPhone 5s is the black or white iPhone 5. Too bad the top part and bottom covers are missing.
If rumors are correct, we should hear some announcement in September 2013. Now, it looks like iPhone 5s and iPhone 5c are having the same screen size as iPhone 5.
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(source)