Thermostat makers aren't exactly known for their rapid update cycles, so we've been wondering just when a company as unusual as Nest would try its encore. If a new FCC filing is any indication, Tony Fadell and company aren't resting on their temperature-controlled laurels. While we don't know if it's a thermostat as such, the "home monitoring device" at the US agency sports Nest's familiar circular shape while tossing in some previously unseen
