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 iPod Touch with Camera Photos Were Real
Top image from Covino & Rich, Other Images from iFixit
While there has been an ongoing belief that Apple was indeed planning a camera module in the latest iPod touch, one reader has found the most convincing proof when comparing the iFixit teardown of the new iPod touch with the previously leaked images of an iPod touch with camera.
When comparing the teardown images to the leaked iPod touch with Camera images from radio show Covino & Rich, it becomes obvious that internals of the leaked images line up convincingly with the internals of the third-generation iPod touch. Meanwhile, they are both distinct from the internals of the second-generation iPod touch. Such a finding is beyond the realm of coincidence, which means that this image of a camera-enabled iPod touch was indeed a real Apple prototype:
It's not entirely clear why the camera was dropped from the iPod touch, though rumors suggest Apple is still interested in adding a camera to the device.