The blacksmith hits the hammer when the iron is hot. Similarly, sometimes, a rumormonger decides to spread his rumor when other rumors on the subject his rumor is concerning are spreading like wild fire.
With the rumors of bigger screen and more memory in iPhone 5 going strong, a new rumor says that the display screen size of iPhone 5 would be 4 inches when the next smartphone from Apple comes in October 2012. The rumors of bigger screen in iPhone 5 are not new but earlier rumors did not specify any particular size. The latest rumors suggests 4-inches.
Android phones have gone ahead with large screens that are as big as over 5 inches. Apple has stuck to the 3.5 inch size. The Verge made an in-depth case for a 4-inch iPhone 5 with a changed aspect ratio.
The assumption is that Apple would keep the width of the screen constant, but the iPhone 5 would be made longer. The resulting screen would have an aspect ratio of 9:5 and a resolution of 1152 x 640 pixels. The a reason why Apple kept the iPhone screen at 3.5 inches is because a larger device is just not as portable.