Aliening the recent rumors of iPhone 5 to be having an screen of 4 inch diagonally, which is taller than the current iPhone 4S / 4 model while keeping the width same, a high quality mock up of the device has been created by Ciccarese Design commissioned by macrumors.
The mock up also includes other rumored specifications like smaller dock connector and a flat metal panel in the rear shell. The taller display screen size will encapsulate an additional row on the page for icons on the device. With the increased display, the iPhone will add 11 mm to the current height to the device.

With the report including a number of other specifics including measurements for the new device, we commissioned Ciccarese Design to produce some higher quality mockups of what such a device might look like.
With iLounge’s report indicating that the new iPhone’s body will measure in at approximately 125 mm, which is 10 mm taller than the iPhone 4S, the spacing for the components above and below the display would remain roughly the same.

An interactive 3D model of the mock up is also uploaded by the Ciccarese Design team, which can be accessed via WebGL-enabled browsers. On OS X, Safari users can turn on WebGL by first navigating to Preferences -> Advanced -> Show Develop menu in menu bar and then choosing the “Enable WebGL” option from the Develop menu that appears.
Though there are already various mockups circulating around the web on the next gen iPhone, but this one seems to be quite impressive. Lets see how much close does these mock up are once the device comes out.
