https://www.cnet.com/news/youtube-tv-delays-roku-apple-tv-apps-to-2018/

The apps for Roku and Apple TV, originally slated to launch before the end of 2017, are now scheduled for the first quarter of 2018. Also planned for the Q1 timeframe, a YouTube representative told me, are apps for older smart TVs, namely Samsung sets from 2014 and 2015, and Sony TVs that use the older Linux-based operating system, as opposed to Android TV.

YouTube TV is a $35-per-month live TV service aimed at cable cord-cutters. Unlike the free YouTube you know so well, populated by cat videos, how-tos and myriad independent channels and shows, YouTube TV is a direct competitor to cable TV.