There have been a growing number of reports that Apple is working on a larger form factor iPhone, presumably to better compete with the wide variety of Android devices currently available.
Based on those rumors, there have been also been a number of speculative articles on exactly how Apple might adapt iOS to handle the increase in screen size:
(iPhone 4.7-inch)
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Themes: iPHONE 6, IPHONE 6 4.7, IPHONE 6 4.7-INCH, IPHONE 6 4.7-INCH DISPLAY
Source:
http://gdeluxe.com/if-apple-is-working-on-an-iphone-6-with-4-3-inch-display-what-will-it-look-like/