The Leap developer unit just arrived in the mail, and I'm excited to start testing it out. About the size of a pack of Juicy Fruit gum, the unit looks like it was designed by Apple with sleek aluminum body, a rubberized bottom, and a glass top. Will let you know more once I've got it installed and working.
UPDATE:
Managed to recognized all ten fingers while using the visualizer. 10 different inputs simultaneously with X,Y,Z orientations? Pretty sweet. This is from a $70 unit the size of iPod Nano.