"Hands Free is a new app from Google that will allow you to make in-store payments without ever reaching for your phone or wallet. We are rolling out a preview in select San Francisco Bay Area stores later this year. It is not yet available to the general public."
"Surprisingly, the patent was filed in 2010, two years before Disney acquired Lucasfilm and four years before they invested in Sphero. Looks like they were into rolling droids before anyone suspected."