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 10 and OS X 10.12 to Feature Improvements to Photos App
It is not clear exactly what features will be added to the apps, but Mac Otakara says iPhoto 2.0.1 included tools for editing EXIF information and touch-based brushes for adjusting brightness and other parameters on only specific parts of a photo. Similar editing tools could be added to the iOS version of Photos.
On OS X, the Photos app will see improvements, but Mac Otakara says Aperture-level functions will not be added to the app.
We don't have much information about OS X 10.12 and iOS 10 as of yet, but a recent rumor has suggested Siri integration will be a headline feature in OS X 10.12. Siri on the Mac has been a long-desired feature and the personal assistant will likely be able to do things like adjust system settings, answer quick queries, and open apps.
OS X 10.12 and iOS 10 will likely be coming in the fall months, but we can expect to see a preview of the software at WWDC 2016, which is typically held in June.