In order to get your hands on the latest Apple TV, TVOS Developer beta 9.2 you need to be a paid developer. $99 bucks a year.
What if you want to use the new features like Podcast, Folders, Bluetooth Keyboard Support as well as having siri speak other languages? you have to wait until the public release and who knows when that will happen.
The good news is that you can use itunes and upgrade the ipsw today. providing you have great web surfing skills and find a site , most likely a foreign site to get the firmware download
I wont provide the link to the site directly but in the video ill show you what to do when you get one.
What i will tell you is to Google search the build number not the Name itself. Find build number on TVOS Developer Site
You will also see, watching the video, all the new feature, in detail so you can decide if your willing to do the upgrade.
Watch the video below for all the important details
Bluetooth Keyboard works great with Apple TV 4