Siri will have a male voice and new voice tones for its female voice. It will also suggest follow-up questions and topics you'll want to know based on what you're doing. Siri will also respond to a message with your location, or make a calendar appointment based on a reservation you booked using the Safari browser.
Updates to photos and videos include the ability to loop a live photo to make a movie and grab and save a still frame from a video. There's also a new long exposure effect to get nature shots of things like moving water. Movies captured in "Memories" will now play in Portrait mode, not just landscape
Do Not Disturb While Driving will expand iOS' Do Not Disturb function to phones in cars. It will detect if a phone is being used in a car, based on a Bluetooth connection or by detecting the Doppler effect over Wi-Fi. The feature will silence all notifications and alerts heading to the phone to reduce distracted driving.
AirPlay 2 users will be able to select from a list of rooms and group them. AirPlay is only one-to-one from your phone or Mac to a device. This new capability will bring it in line with competing systems such as Play-Fi, Chromecast Audio and Sonos.