Google announced today that the upcoming Moto X4 will be available as an Android One device on their Project Fi mobile network. The smartphone will run Stock Android and come with a guaranteed minimum of two years of software updates and support from Google.
https://www.notebookcheck.net/Moto-done-right-Moto-X4-coming-to-Project-Fi-will-receive-two-years-of-updates.249654.0.html