I disconnected the TV from the Internet and the interactive features became unavailable, so I think it’s pretty clear that the content is delivered Over-the-Top. The app itself (or maybe my set) is really slow and glitchy.I dumped out the files (since I have the Dev unit) and I don't actually see anything included, not even a pointer, but I'm not sure how abstracted away the HDHR actually is or if there's something being filtered out. I'll have to ask.
What did catch my eye though is that the manifest.xml file seems to imply the video is actually in 1080p.
<Representation bandwidth="7500000" codecs="hvc1.2.4.L123.11" frameRate="60000/1001" height="1080" id="Video1_1" sar="1:1" scanType="Progressive" width="1920">
I’m seeing the video stream as 1080i. Gotta love the content on TBD... 🙄