When the new Apple TV launched back in November last year, a few days after headline after headline popped up in the Apple community regarding various things that had been discovered that the new device couldn’t do, one of which was voice dictation meaning the user was forced to go through the process of manually entering each character. Also things such as keyboards couldn’t be used with bluetooth initially as well as the iPhone remote app, since then things have been sorted and now, well in a beta at least is voice dictation.
The new feature allows you to use the Siri button on the remote to enter in text, passwords and searches by just using your voice. This also ties in with the use methods from iOS, users are now very accustomed to iOS and the way it works, by bringing features over from that platform to tvOS makes sense.
tvOS 9.2 is expected this spring.