I'm guessing the point of something like this is so that people aren't preparing for the normal, mundane questions that typically come up in job interviews but I do think it would be nice if there were a bit more details, especially considering 'some [questions] require a short video response'. I'm currently sitting in bed and my voice probably still sounds like I just woke up so a video response from me would not be very attractive to employers.
Questions like "Do I only get one chance to respond to the questions? Or can I have multiple video responses?" should be at least addressed at this point so people like me aren't going in blind and have potentially-awful videos. There is no need to prep anyone on the question material, just some basic info.
Again, great idea...just thought I'd give some feedback...Cheers!