The document discusses potential future directions of user interfaces as display and interaction technologies evolve. It considers whether interfaces will get smaller or bigger, use cursors or touch, prioritize images or text, emphasize design or simplicity, allow single or multiple pointers, feature vertical or horizontal scrolling, and have fixed or flexible layouts. The document also speculates that interfaces may incorporate virtual keyboards, multi-touch, new ergonomic models, and revolutionize concepts like windows, buttons, and drag-and-drop.