Thanks to new in-cell display panels, a smaller dock connector and other modifications, the new iPhone is going to be thinner than ever before. How thin? The casing for the handset has been measured at 7.6mm.
While that doesn't sound like a very big difference — just 1.7mm thinner than the 9.3mm 4S — it's certainly noticeable. Just look at these two comparison photos showing the new iPhone, the 4S and the 3GS...