I've just noticed something. The video linked on the store page isn't a broken link, it actually links to a private video.
https://www.youtube.com/watch?v=hAhXBq9krjUI have 2 theories for this. Either it links to a video on a Sony channel showing a teaser put together (using existing footage) for the store page that they're waiting for approval to show, or YS NET have put together a new video that they're going to publish with an upcoming KS update. Exciting stuff!