Speaking of leaked Apple bezels, 9to5Mac has also posted a picture (from a a Chinese reseller, natch) of what it believes to be a bezel from the iPhone 5. How a Chinese reseller might have obtained such a part (and posted it on their site, no less!) is a valid question, but let's take it at face value and assume that it's real.
9to5Mac believes that it's the digitizer panel for the fifth generation iPhone’s touchscreen. Its design is similar to the current iPhone 4, and past iPhone models, but with a larger screen cutout area.
No measurements were included, but when compared to the iPhone 4 digitizer (above) the new cutout could house a four-inch display. This meshes nicely with previous rumors coming out of China that Apple is working on a larger four-inch panel for the next iPhone to better compete with the larger displays now shipping on several Android phones. The current iPhone 4 includes a 3.5-inch touchscreen.