You'll be able to try these new features on iOS 11 (beta comes out in June):
Group FaceTime video calling with up to 5 people.
Peer-to-Peer Apple Pay. Apple is completely revamping the Wallet app (renaming it to Pay) and adding social functionality. There will be a social feed, just like Venmo. The new Pay app will also have an iMessage extension that allows you to send cash via iMessage.
FaceTime Audio is going to become the default calling method for iPhone users. Meaning if you call any iPhone user, it will automatically use FaceTime Audio so that you can enjoy a crisp, high quality calling experience. If you call a non-iOS phone, it will fallback to the older cellular calling technology (the one that is currently standard and sounds terrible).
Intelligent, automatic low power mode. It will study your low power mode habits (how often and when you turn it on) and adapt to that schedule. It will also be location and context based. For example, if you leave your home wifi network and have 20% or less, it will turn on low power mode automatically.