It is in the play store for Dutch nvidia shield users, and it works on Nvidia shield at least. There is no hdr yet though. I don't know if there is no hdr content or if hdr is just not working in the app.
I'm from Holland and already have the app installed on my Xiaomi Mi box.
But at this stage the app isn’t working on my AndroidTV - keeps crashing on startup. Also not in AndroidTV Play Store yet on my MiBox, had to sideload it. Said to be working on the nVidia Shield though.
They said yes in the initial presser