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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Apple Seeds Fourth Beta of iOS 10.3.2 to Developers [Update: Public Beta Available]
Registered developers can download the fourth iOS 10.3.2 beta from the Apple Developer Center or over-the-air with the proper configuration profile installed.
Apple doesn't typically provide detailed release notes for its iOS updates, so we don't yet know what features, improvements, or bug fixes might be coming in iOS 10.3.2, aside from some fixes for SiriKit car commands, outlined in the release notes for the first beta.
As a minor 10.x.x update, we can expect iOS 10.3.2 to offer bug fixes and performance improvements rather than outward-facing features. No notable features were found in the first three betas, but if anything new is found in the fourth iOS 10.3.2 beta, we'll update this post.
Update: Apple has also provided the fourth beta of iOS 10.3.2 to public beta testers.