It seems that parts of the upcoming iPhone 5 has been leaked in China. Yes, the image is the rumoured iPhone 5 screen component.
As you can see, the front bezel of the claimed iPhone 5 part features a much larger screen as compared to today's iPhone 4.
China's 1st iPhone 5 photo has surfaced! From this photo it seems that the screen size will be larger than iPhone 4. There has been a lot of specualtion about a larger screen and maybe this will be one of the upgrades we will see when iPhone 5 is released this summer.
If this is indeed for the next-generation iPhone, this would match the claims of a larger 4-inch screen as well as claims of a "edge-to-edge" screen which results in the thinner bezel. But it's hard to tell without the currect iPhone 4 next to this screen part.