From the upgrade dialogue:
iOS 10 is the biggest release of iOS ever.
A massive update to Messages brings the power of the App Store to your conversations and makes messaging more personal than ever.
Find your route with beautifully redesigned Maps. Relive memories like never before in Photos. Use the power of Siri in more apps than ever. A new Home app to make controlling your home even easier. And all-new Music and News.iOS 10 introduces new features and improvements including:
Messages lets you express yourself in new ways and access your favorite apps right in your conversations
Siri now works with apps from the App Store to send messages, make phone calls, and more
Maps comes with an all new look and extensions to make reservations and book a ride
Photos is all-new with intelligent search making it easier to find people, places and more as well as new and beautiful ways to rediscover your memories
Home is a new app that lets you simply and securely manage your home automation products in one place
Apple Music has an all-new design, bringing greater clarity and simplicity to every aspect of the experience
Apple News has an all-new design adding bold typography, vibrant color, and distinct sections that make it easier to find stories on specific topics
Accessing the information you need is easier and quicker with a redesigned Lock Screen and deeper 3D Touch integration
QuickType keyboard adds new emoji, multi-lingual typing, and contextual predictions that leverage deep neural network technology
Suggested events and contact details are added to apps based on information found in Mail