Gotta Be Mobile posts a pair of photos of what it calls an "engineering sample" of the next-generation iPhone. While it isn't entirely clear just what the sample represents, it seems to be solid chunk of aluminum machined into the form factor of the rumored device.
Assuming that the sample is genuine and related to the iPhone development and production process, it supports previous photos and rumors showing a large central section on the back plate that differs from the top and bottom portions of the rear casing.
Measurements on the sample are also in line with rumors that have pegged the next-generation iPhone at roughly the same width as the iPhone 4S (5.86 cm) and somewhat taller (slightly over 12 cm compared to 11.52 cm) in order to accommodate a larger display.
Article Link: New Photos of Next-Generation iPhone 'Engineering Sample' Massing