Android TV is very much alive, as was made abundantly clear by the plethora of new Android TV powered televisions with Google Assistant capability shown off at CES 2018. Streaming boxes powered by Android TV, however, are conspicuously missing—the last Android TV set-top box to be released in the United States was the Xiaomi Mi Box in October 2016.
Apple TV and Amazon's Fire TV products both received hardware refreshes last September, while Roku products received hardware refreshes in October. In comparison, the three year old Nexus Player—arguably the flagship of Android TV—last received a software update in November, and will not be upgraded to Android 8.1 Oreo.
Source : http://www.androidpolice.com/tags/mi-box/