https://www.cnbc.com/2017/09/06/ios-11-changes-teased-ahead-of-release.html

Apple is using pop-up alerts to tease new features coming to the iPhone and iPad.

The company began rolling out new "tips" pop-ups on Tuesday. Users may have started to see the alerts appear on iPhones and iPads that look like the image above. The tips show users some of the new features that are going to launch soon in iOS 11.