The photo is relatively small, but the resolution is good enough that the redesigned flex cable connectors on the iPhone 5S part can be seen. On the iPhone 5, the two connectors supporting the display itself and the touch digitizer are both oriented horizontally, while on the iPhone 5S one is oriented vertically and the other horizontally.
The report suggests that the photo points to mass production of the display assemblies already being underway with the possibility of the device being ready for launch earlier than expected. Mass production of the display was, however, previously rumored to be ramping up this month, and a public launch is expected around the September timeframe alongside the release of iOS 7.
Parts for the iPhone 5S are beginning to leak with increasing frequency, and over the past several days we have shared several photos of the rear shell and internals from an early iPhone 5S prototype, revealing a new A-series chip, a larger capacity battery, and an updated rear camera system with dual-LED flash.