For those who didn’t know or haven’t checked for updates there was an update release for iOS10. If you would like to see the main features I found this article useful:-
The upload is large 1.1 Gb and does take a long time to do. On my devices it took nearly an hour to complete. So give yourself plenty of time to do the upgrade ( not like me that thought he could do it in half-an-hour and missed an appointment!).