As noted by @chronic, at least one reseller has managed to get their hands on another iPhone 5 part. This time it's a iPhone 5 proximity light sensor flex cable, pictured above.
We asked iFixit's Kyle Wiens about the differences. He noted that the corresponding iPhone 4 part (pictured above/right) contains the power button, noise canceling mic and proximity/ambient light sensors. The new iPhone 5 part doesn't contain the mic, so it must be placed elsewhere.
Previously, we also saw the dock connector to the iPhone 5 leaked. So, while we can't build an iPhone 5 yet, the leakage of individual parts is likely a sign that we're getting closer and closer to launch.
The most recent rumors have the iPhone 5 launching in October.
Article Link: More iPhone 5 Parts Leak Ahead of Official Launch