It's going to be a while until we are able to bring the 4.0 improvements from iOS and tvOS to Android but we were so excited about how much of an improvement the new PIN authentication in the tvOS beta is that we've brought it to Android early.
You can get the latest Android beta here.
As @maddox said: Gone are the days of entering a foreign URL into your phone to authenticate. Now you can get Channels working remotely super fast!