Do Not Disturb learned to automatically detect when a person is behind the wheel and hide distracting notifications. It also sends automatic responses to text messages to let the other person know you're busy.
Messages in iCloud, Apple's solution to syncing up iMessage conversations across various devices like iPhones, iPads, and Macs. It sounds like a small thing, but if you use iMessage across your gadgets, it's surprisingly comforting to know that deleting a text from your phone will delete it everywhere else. Like AirPlay 2, this feature was included in iOS 11.4, which started rolling out last week.
ARKit, the company's platform for creating augmented reality that users experience through mobile devices. The demos were impressive— people seemed very excited to put virtual Ikea furniture around their houses and offices for a while after release—but there still aren't many must-have AR apps on the App Store at the moment.
Automatic Setup, a re-imagining of how users setup Apple devices. You mostly just hold your iPhone or iPad next to the device you're setting up and the magical iOS gnomes handle the rest of the process for you. I tried it with both a HomePod and a new iPhone this year, and it's very handy.
The iPad's full-fledged multi-tasking mode in iOS 11, which lets users run several apps at a time and takes advantage of the iPad Pro displays.