According to Chinese technology blog MyDrivers, the image comes from supply chain sources and it is claimed to be 100% real.
The site writes that this front panel has a larger, 4-inch display.
The sources also claim that it is built using in-cell technology that allows the introduction of touch sensors directly into the screen. This would help Apple build a slimmer display, which would make the device thinner.
The first image presents the panel of the future iPhone, while the second one displays the iPhone 4/4S panel.
Comparing the pictures, you can see that there is no notable difference between them.
Judging by the pictures, this could mean that the iPhone 5 will have a screen as big as that of the iPhone 4S.