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.
16" MacBook Pro Now Available
Find My Friends Updated With iOS 7 Redesign
Other than the new design, Find My Friends does not appear to have any new features.
Last week, Apple released updated versions of iBooks and iTunes U with similar redesigns.
Find My Friends is a free download for the iPhone and iPad from the App Store. [Direct Link]