When I dragged the clip to its maximum length I did feel a little bump. Without looking at the timeline and looking at the viewer, I could ‘feel’ the end of the clip.
This feature presages the ability for UI pixels to be ‘bumpy’ – for user to feel the texture of application UIs without having to look at where the cursor is. This means that seemingly textured software keyboards and control layouts will be able to be implemented on future trackpads, iPhones and iPads.
This is a game-changer. Imagine how this can be implemented as an accessibility feature, too.
Update: Craig Hockenberry:
The iPhone showed us how amazing touch could be as an input device, [Apple Watch] will show us how awesome it can be as an output device.