They just added the ability to hold down on words in any android app and get information on the word. For example if you press and hold "chinese food" it will pop up with yelp reviews of nearby places. This is not available on all flavors of android IIRC.
It's amazing the amount of people who immediately cry hoax. Someone raised a good point about taking money from locals and bringing it to Europe/America/China, but clearly this isn't breaking the law of physics.
I use it in my class with my project mates. You can only have one person working at a time otherwise it's a disaster, but as far as "over the shoulder" programming it works very very well.