One of my favorite features in Apple's iOS 9 release is the ability to turn the iPad's on-screen keyboard into a trackpad, an extremely useful addition that power users will love.
The premise of the updated keyboard is fairly straightforward. Dragging with two fingers on the keyboard in any direction will cause the keycaps to go blank and the on-screen cursor to follow your movements.
The gesture is just like the one used on a Mac trackpad for two-fingered scrolling, and will come naturally to Mac users. Notably, the iPad's keyboard still retains its multitouch capabilities during normal use, and the scrolling function is difficult to activate by accident.
Interestingly, in apps where the new gestures are not yet fully supported — most third-party word processing apps fall into this category — the keyboard-as-touchpad works more like a traditional mouse, moving the cursor independent of the text in the window. This could simply be a sign of apps that have not yet taken advantage of this new feature.