Peek and Pop Explained

A nice description of the new Peek and Pop gestures, from David's hands-on time with the new iPhone 6S:

3D Touch basically enables the phone to measure not just when you move your finger up and down, left and right, but now also through. When you press a little harder, you get what's called "Peek"—a pop-up of the contents of an email, or the status of a flight, or a quick way to call the business you're tapping on in Maps. Press more, and you "Pop." That's when you jump to a new place in the operating system. You can press on icons on the homescreen, too, and jump straight to the selfie cam or call your mom without ever actually opening the Phone app.