Interactive notifications. iOS's new Interactive Notifications feature allows you to respond to updates from various sources without leaving the app you're currently using. For example, you can "like" the Facebook post of a friend right from the notification bar.
Keyboard. Quicktype is a keyboard feature that promises improved predictive-text recommendations—a traditional weak point for iOS devices. Not only will you see multiple suggestions for next words in a sentence, but the app will also make those suggestions based on the context of what you've already typed—and it's available in several dozen languages.
iMessage. Group messages can be named so you can find them easier. Also, you can check in or out of threads as your availability or patience permits. Coolest trick: The tap to talk feature within iMessage allows you to send a voice or video recording from at any point during the text message without much effort. For example, to send a voice recording, just raise the phone to your ear and start talking. You can share your location with other people you're messaging, which isn't really new. What is new is that you set a time limit for making that data available.
Health. Apple's new Health app collects data from multiple fitness apps, such as heart rate, miles walked, glucose levels, etc. and puts them under one roof for easier access and possibly more comprehensive analysis of your condition. Some apps, such as a new one from the Mayo Clinic, will also allow patients and doctors to communicate in real time.
Photos. iPhotos has been improved to sync all of your photos across all of your devices and search for them in ways, such where and when they were taken. There are also more and easier options for tweaking those photos with the on-board editing tools, the results of which are shared with all devices on your account.
Siri. Now you can talk to Siri without pushing the home button, and have her recocnize songs that are playing in the background via Shazam.
App searches. For the first time, you'll be able to buy multiple apps at one time with just one tap. Also new is the option of a video preview that can accompany apps, such as demos or key-feature roundup.
--Donna Tapellini and Mike Gikas