this been posted before :
http://www.technologyreview.com/view/428350/the-most-important-new-technology-since-the-smart/#ooid=VkYW04NTod5cDwz247vs1gGVcq_jw0X4 ?
The fact that the Leap can see almost any combination of objects - a pen, your fingers, all 10 fingers at once, should make every interface designer on the planet giddy with anticipation. If you thought that the touchscreen interface on the iPhone and subsequent tablets opened up a whole new way to interact with your device, imagine something that combines the intuitiveness of that experience with the possibility of such fine-grained control that you could do away with the trackpad or mouse entirely.
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Hard to imagine that 3d drawing will be useful for us but imagine 3D sculpting with your hands!