Apple today released the very first beta of tvOS 11.3 for testing on the Apple TV before an initial release to the public. This comes the same day the first build of iOS 11.3 landed.
To install the new build on your registered Apple TV, head over to Settings > System > Software Updates > Update Software and hit the download button. Both developers and public beta testers can expect this build this week.
There isn’t much new in this build other than bug fixes and security improvements, but we’ll, of course, let you know of any important changes spotted along the way.