PRIME VIDEO APP UPDATED TO v1.0.1 12/20:
"5.1 surround sound is now available for UHD content on Apple TV 4K and coming soon for SD and HD content on Apple TV 4K and Apple TV (4th Gen)"
I noticed last night, when I started watching The Royals, my AVR reads Multi-Channel PCM (5.1), but, not with anything else I've tried so far.
(ATV 4th gen.)
So, I think the app update works with it, but, something else being done online, maybe each content file has to be updated, so rolling the update out may take time?
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I assume streaming 5.1 will never come to the ATV3?
I'm still not seeing it on an ATV3 (7.2.2) and Amazon Prime watching Vikings. I do get 5.1 with purchased iTunes movies, and that SpeakerCheck iPhone app, airplayed.
IDK, but, it seems the content is being updated on the server side, so, maybe???