As every operating system developed by Google has had one thing in common: all based on the Linux kernel, and developed in twos, Android for mobile devices and Chrome OS for laptops and desktops.
Google's third operating system, Fuchsia, is a digression and perhaps an operating system specifically for embedded hardware, especially in the case of embedded devices like car dashboards or GPS units, as Linux kernel can impact performance and may cause some problems.
Fuchsia is based on Magenta kernel, designed to work across a wide range of devices—from small "embedded devices" all the way up to mobile devices and even desktops.
It makes use of Google's Material Design-friendly Flutter user interface framework, as well as Dart as the primary programming language.
With Google’s inroad into embedded hardware, like Google Home, Fuchsia may be partly developed for those devices in mind. Albeit, there is always the possibility that this is another Google experiment, and may never see the light of the day.