A help forum post details the program, which you can sign up for through the Cast app. To get going, launch the Android or iOS app tap Devices. Then touch the overflow button (three vertical dots) select Device settings. From there, select eview ogram then you can agree to join it. 

— Cast (@googlecast) September 13, 2016 says you’ll get email updates when there’s new firmware available for you. The help page also details that this is not a beta program, so your software should be rather stable ready to use. You’re just getting it before everyone else. The impact on you: Chromecast is the easiest way to get video from a phone, tablet, or computer to your TV. Chromecast Audio pulls a similar trick for music, making the hardware a nice affordable duo for streaming. It’ll be worth watching what new software rolls out how plans to use these devices to further shape television listening habits.