As of 5 June 2017, 5:00 pm UTC-4, there was no video. I predict this is going to be a unifying reviews/information tool for the Apple ecosystem.
But I hope it's also a competitor for Slack.
But I hope it's also a competitor for Slack.
Edit: looks like I was looking at a different page so screenshot wasn't removed just elsewhere: https://developer.apple.com/business-chat/