I'm on an airplane and the wifi's very spotty so bear with me.
The specs you posted are a bit confusing. How come the 720p one still mentions UHD resolution of 3840x2160?
Well, no matter, since the specs for the 4K trailer are what's interesting. Normal movie frame rate of 23.98, ok, but encoded in AVC at 9mbps? That's just way too low to achieve proper 4K.
Of course, Terminator Genisys not being a real 4K movie helps. It was shot digitally on a camera which captures an effective resolution of 3K. All digital effects were done in 2K, and the movie was finished in 2K. A 4K master was created by upscaling from the 2K master.
So the master does not have actual 4K's worth of detail and resolution to begin with. That certainly helps when compressing the video using low bitrates. Another trick is to run the video through a softening filter before compressing it. The filter removes tiniest, sharpest details, blurring the image slightly. It's usually hard to notice if you can't compare filtered video to the original side by side, but it helps compression quite a bit.
If the full movie was compressed in AVC at only 11 mbps... oh boy. Surely NanoTech can't be so dumb as to stream low bitrate AVC to 4K displays that have HEVC decoding built-in specifically for 4K streaming?
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