@blenky, Steam Link is now finally available, albeit still as a beta.Typical
I can confirm that the app has appeared on my UK model's "app shop".Samsung has published their release candidate build in the app store, available in 54 countries worldwide.
Fixes in this build:
Fixed initial pairing and discovery issues
Added support for advanced streaming settings
Added support for 4K streaming on 2017 TVs
Finalized shipping controller support (Steam Controller, Xbox 360 wired and wireless, Xbox One wired, Logitech F510/F710)
4K streaming is not supported on 2016 TVs (models KS and KU) and you'll get a black screen if you try it.
Entering PIN authorization code is not supported and the stream won't start
Other errors starting streaming are not reported, check computer to make sure it's not locked and Steam doesn't have a driver installation dialog up
Rumble on Xbox controllers causes a lag spike