iOS 10 makes extended use of 3D Touch-driven gestures on the iPhone 6s and iPhone 6s Plus. For instance, you can 3D Touch the bottom row of icons in Control Center to set flashlight intensity, start the timer, go to your last calculation and jump directly into a Camera mode.
You can also clear all notifications with 3D Touch and now I've stumbled upon another handy 3D Touch shortcut on iOS 10: folder renaming and seeing apps inside a folder with missed notifications.