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.
macOS Catalina Now Available
Apple Announces iPhone Software Update & SDK Release Date
iPhone SDK Release scheduled for February
New Software today
Google Maps with Location
Webclips - website bookmarks on your home screen. Clips will remember where you zoomed/panned to, and you are able to create up to 9 of them.
Chapter Options & Language Capability - now available in iPod mode.
Available today as a free update to all existing iPhone users.
Many of these features were recently previously rumored.