1. You can finally take the iPhone's native apps off your home screen, like Mail, Safari, Maps, Stocks, and so on.
However, you unfortunately won't be able to fully uninstall them.
2. The clock app is now dark, which means no more blinding brightness when adjusting your alarm at night or in the morning.
3. A new redesigned notifications shade that could actually be useful.
The notifications shade in previous versions of iOS is notoriously bad at showing notifications and hard to manage, but it looks like it could look a lot better in iOS 10.
5. You'll be able to use 3D Touch in way more places than before, like the notifications shade, the control center, and eventually third-party apps, which should help you actually use 3D Touch if you haven't been already.
Source: iDeviceHelp/YouTube
6. Widgets will let you see some basic information from apps like weather, your calendar, and news, so you don't have to open them all the time — just like on Android!
7. Searching for a specific photo among your thousands of photos will be so much easier, like that one photo where you're riding a horse in a lake by a mountain.
8. The new Raise To Wake feature that wakes your iPhone when you raise it up will let you read your notifications before using TouchID.
Source: zollotech/YouTube
When the iPhone 6s came out, people were actually complaining that they couldn't read their notifications before their iPhone would unlock because TouchID was too fast when they pressed the Home button.
