from 9to5mac.com
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http://www.9to5mac.com/53901/iphone-5-part-surfaces-shows-larger-display-and-thinner-bezel

A purported image of an iPhone 5 part has appeared on a Chinese reseller of Apple parts’ website. Specifically, this part may be the digitizer panel for the fifth generation iPhone’s touch screen. The part’s design appears to be similar to that of the one found on the current iPhone 4 and past iPhone models, but the screen cutout of the panel appears to be much larger than the one found on panels for the current generation of iPhones. No measurements for this cutout have been posted, but it could be the cutout is for a four-inch display, and this matches up with reports from Apple’s production lines in Asia.
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http://www.9to5mac.com/53901/iphone-5-part-surfaces-shows-larger-display-and-thinner-bezel