(Oh come on, you saw that pun coming.)
The new "employee", rather unfortunately named the Accelerated Life Test Apparatus, is basically a long Lego-brick arm gripping a stylus, which moves back and forth, left and right. The aim of these tests is to see how well the LCD screen will respond to a non-robot trying to take notes on the tablet.
Check out the Kno's informative above of the Lego bot doing its thing. Although the idea of a tablet that has had some interaction with Lego may be a selling point enough, sadly you will only be able to get your hands on the $599-$899 Textbook if you are a student or teacher, invite only.
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regrets giving her Legos to her neighbor's kids now...