Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
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Leaked Photos of Alleged 2019 iPhone Logic Board Surface
The logic board has a rectangular design, so we assume it belongs to the 2019 successor to the iPhone XR, as the iPhone XS and iPhone XS Max have L-shaped logic boards. The board appears to have been manufactured in early March based on its "1019" date code, which corresponds to the 10th week of 2019.
Only one side of the logic board is printed. While the layout of the chips and circuitry looks quite different from the current iPhone XR logic board, we cannot gather any specific changes from the photos.
The next iPhone XR is expected to feature a dual-lens rear camera system, new green and lavender colors, and 4GB of RAM. The device is also expected to feature up to a six percent larger battery to accomodate a two-way wireless charging feature rumored to be coming to all three 2019 iPhones.