A Chinese website posted this diagram that reportedly shows the dimensions of what could be the iPhone 6.
The device clocks in at 5.9 inches from top to bottom, and 3.3 inches across—a huge leap from the 4.8 x 2.3 inches that make up the iPhone 5S. With all things considered, this would give the phone a 5.5-inch display, which is consistent with recent rumors. While this could be our first glimpse of what the next iPhone may look like, rumors have also suggested that Apple will still release a second version of the phone, which could either be the same size as the iPhone 5S, or perhaps even bigger that the one proposed below.
Here's a visual comparison with the iPhone 5S.