One can only assume that if Now TV is working as expected on Sony Android TV then no doubt the other devices that use Android TV will follow suit.
That exact question has been asked to Now TV staff.
I would not be surprised if the launch of this app is because of the launch of the new Google Chromecast with Google TV: https://store.google.com/product/chromecast_google_tv
The timing is too much of a coincidence!
However I am more than glad that I can now get Now TV natively on my Sony Bravia running Android TV 8!
I read that it's in the Google Play Store but only shows up for Sony devices, not Now TV devices.
How can we ask someone at Now TV and not just the chat support who don't seem to be able to help with this sort of question?
The launch has only been for Sony Android TV.
Now TV often keep releases like this quiet until launch.
You can guarantee that some point and probably soon we’ll see Now TV on all Android TVs. The launching on Sony Android TV has been years overdue, but better late than never!
Considering Now TV kept the Sony Andriod TV testing and launch under wraps I wouldn't be surprised if other Andriod TV devices followed suit.
Ideally I would also like Now TV to be on Amazon TV sticks as I prefer Amazon over Roku. Whilst I understand Amazon runs on a similar type of Andriod to Sony etc.
Ideally we won't just get a working app, but a fully integrated app with Google TV in the same way that netflix, Amazon prime and Disney+ are integrated.
I would be much more inclined to have monthly passes more often if I saw content suggested on the Google TV interface.