I don't think anybody, including Leap, thinks the keyboard and mouse are going anywhere. Also, this isn't minority report. If leap can deliver on the sensitivity of the input, then small, precise gestures can be made without moving your hands from the keyboard. That makes it useful in cases where switching from the keyboard to a mouse isn't fast enough for my taste.
I can envision opening certain applications with a gesture (save you from typing the name into quicksilver or finding and double clicking on the icon). Tasks that you repeat over and over could be assigned to a gesture with great effect, like swiping a finger left and right to change windows.
3D editing could be interesting, where you move an invisible object in 3 dimensions with your hand. Anybody who's done 3d modeling or game development in unity can attest that a mouse and keyboard are limited in 3 dimensions.
I can envision opening certain applications with a gesture (save you from typing the name into quicksilver or finding and double clicking on the icon). Tasks that you repeat over and over could be assigned to a gesture with great effect, like swiping a finger left and right to change windows.
3D editing could be interesting, where you move an invisible object in 3 dimensions with your hand. Anybody who's done 3d modeling or game development in unity can attest that a mouse and keyboard are limited in 3 dimensions.