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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iOS 9 Code Suggests 12.93-Inch 'iPad Pro' Could Have 2732×2048 Display
Apple's existing lineup of iPads with Retina displays, ranging from the third-generation iPad to iPad Air 2, each have 9.7-inch screens at 264 PPI, so it would make sense that the larger 12.9-inch "iPad Pro" would have a scaled up resolution with the same pixel density. Specifically, a 2,732×2,048 display with 264 PPI points towards an approximately 12.93" diagonal screen size. As a @2x display, this would represent 1,366x1,024 points as shown in the onscreen dimensions for the keyboard.