I agree with Nick, that a 3D GUI is the logical next step, but no gloves - instead a Kinect-style interface and probably a projected keypad. And don't forget the voice recognition aspect, either (particularly useful for those of us who type slower than we speak, but also enhances security and allows simultaneously working with hands and voice). The mic and headphones would be built into the 3D headset/glasses. In fact, for maximum security and flicker-free 3D, building the display right into the headset would be optimal (particularly to replace laptops).
What's Next for Apple: OS 11