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You can review the video you've taken. I'm not sure if the timeline cards support the video HTML tag. The hardware can handle it, so this is just a software limitation,

Yeah, I have them. You can definitely watch videos you've taken, hangouts, etc. Even the navigation maps are realtime updated, rather than still photos.

Lots of their promotional stuff showed the wearer in a video hangout, so I assume this is in the existing hardware.