Yesterday, Apple released their iOS 11 update, which comes with a bunch of new features, including a brand new control center (features when you swipe up from the bottom of your phone), a very different (and easier to access) Emergency Mode, a very easy way for one device to share a Wi-Fi password with another device, and a TON more. Check the link below for 15 hidden hacks for the iOS 11 update.
Also, if you're curious about what apps aren't compatible with the update, you can find out by going to:
Settings > General > About > Applications
There's a screen there that will show you what will not update when you switch to the new iOS.