We have just received the news from insiders is that Apple has begun testing iPhone6 prototype for some time, and its size is 4.9 inches. In addition to screen size, no more iPhone 6 news, but the news source also revealed that next year Apple will release two big-screen iPhone, ie iPhone5S and iPhone5C is an upgraded version of the big screen, but the screen size of an upgraded version iPhone5C Still not sure whether it is 4.9 inches.
There has been a lot of speculation on Apple's plan for the iPhone next year. A recent Bloomberg report claimed that the company will release 4.7-inch and 5.5-inch iPhones with displays that curve downward at their edges in the second half of 2014.
Although unconfirmed, it's widely believed that Apple will increase the size of the iPhone's display next year.
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