https://www.cnet.com/news/apple-releases-ios-12-2-with-apple-news-plus/

iOS 12.2 is also necessary to set up the imminently arriving "Hey Siri"-enabled new AirPods, and includes support for the Logitech Crayon on Apple's iPad Pros and other iPad models. There are new emoji (hello owl, warthog, shark). iOS 12.2 also introduces iPhone/iPad support for AirPlay and HomeKit via new enabled non-Apple TVs and devices.

The update's features were pretty well-known since the iOS version became available as a beta for developers.