When Apple holds a keynote event to introduce something new they typically focus on the marquee features, summarizing the ins and outs but not divulging all the specific details. When 3D Touch was introduced some of the more commonly used features were demoed on stage such as app shortcuts and peek and pop features. One of the features that I find most intriguing and quite frankly incredibly useful is the new keyboard trackpad.
As seen above, when 3D Touching on the keyboard, you can now activate a trackpad like cursor that you can move around freely, just like using a trackpad on your MacBook. Most users are familiar with the old skool way. Pressing down on the screen to reveal the magnifying glass and carefully moving the cursor to the proper position.
This offers a much more convenient and quicker way to get your cursor to the proper position in whatever app you are using.
Enjoy.