Hitachi is joining the growing list of companies that make Roku TVs. Both 1080p and 4K sets will be released "in a variety of screen sizes" beginning this fall. No specifics beyond that have been announced at this time, but the Hitachi Roku TVs will be based on "Roku’s low-cost TV reference design" and include the popular streaming software built in. That's the convenience factor that comes with choosing these TVs; there's no need to buy a separate set-top box or streaming device.
Other companies that've backed Roku TV include TCL, Hisense, Sharp, and Best Buy's Insignia brand, which launched sales of 4K models back in March. The picture quality on these doesn't live up to top-end sets from the likes of Sony, Vizio, Samsung, and LG, but that's not the point. Rather, Roku TV makers (now including Hitachi) are betting that the convenience of an all-in-one package with good software, decent enough picture quality, and a low price will be enough to entice consumers.