As is clearly visible in the images inserted below, the display assembly sports the same mystery chip that was spotted on earlier blurry images. Rumour has it Apple will add a Force Touch feature to the upcoming iPhones, and the source of these images suggests it is indeed related to that feature. The closeup image reveals the chip, which is visible in the cutout in the metal shielding behind the display.
The source didn’t (or couldn’t) provide any more info about the mysterious chip, but did say that the part is slightly thicker and heavier than its iPhone 6 counterpart: The leaked component weighs 51.2 grams, while the iPhone 6 display assembly (with the front-facing camera and bracket included) weighs only 49.4 grams. The difference, however, will likely be equal to the weight gains of the iPhone 6s rear shell, which was found to be 2 grams lighter than that of the current model.
Just to throw some information into the mix, Chinese blog Feng claims it has information about the iPhone 6s and 6s Plus batteries. Its sources claim that Apple will likely shrink the iPhone 6s Plus battery size (up to 24 hours on 3G is too much, guys?) from 2910 mAh to 2750 mAh, and the iPhone 6s’ battery from 1810 mAh to 1715. I think we should take it with a huge pinch of salt.