It strikes me as a huge productivity enhancer for low-end model animation if it does what it appears to in the video!
HOLY SHEEIT! Motion-capture for action-figure / doll lovers? I'D TOTALLY BUY IT (even if it means going broke for it)!
Well, more like Keyframe Capture rather than Motion Capture, but it still beats the traditional "clicking and dragging an arm for several minutes till it's in the right position" method.
Oh, and even better; this completely eliminates the need for those tedious IK setups! (Well, except for snakes and sort, anyway)