Google partnered with the Deaf and hard-of-hearing community to develop sound notifications within Live Transcribe and Notifications, which can detect critical household sounds such as a fire alarm or a knock at the door and notify you on your phone or watch when they occur. These notifications can be through a regular popup on your phone, a flashing light, or a vibration on your watch.

Source: All the new fun and helpful features coming to Android

Not something I expected in this list