If you are referring to Revolv, Nest/Revolv stopped selling the device the day Nest acquired them (Oct 2014), and they are also issuing refunds to anyone that contacts them[0]. The other major hardware cancel I know about was the Nexus Q which Google also provided a full refund for anyone that contacts them.
Sure, Google could cancel it, but they seem to only do that with something if it was a total flop, and they then do what they can to fully refund whoever was effected.