While the screen diagonal is expected to stay the same, there are subtle differences, like using one horizontal and one vertical connector instead of two vertical ones on the iPhone 6. The flex cable for the Touch ID finger scanner has also been straightened out, as opposed to being bent on the iPhone 6.
These differences in cabling might be hinting at new screen technologies, like the rumored Force Touch solution, or the glass-on-glass lamination that will eventually find their ways into the upcoming iPhone 6s. The rest of the specs are expected to be a faster Apple A9 chipset, 2 GB of RAM, and a fresh 12 MP camera on the rear - not too shabby for a hardware upgrade. Check out the new iPhone 6s screen assembly get compared with the iPhone 6 display package in the video below.