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It's called All Hands, and we've launched today: https://allhands.app
The idea is that instead of pressing the big red stop button on the side of your business every week in order to keep everyone up-to-date, you instead schedule in and pre-record the things they need to know. All Hands does the workflow part, lets you include other people (so it's easy to have different people presenting), makes recording easy (all in the browser, no extensions - MediaRecorder is cool!), and then does the sharing + reactions part (emoji + comments). Crucially we're also collecting (anon) stats and (optionally anon) feedback to help teams make the _next_ update more relevant.
We can see more use cases than just the companywide stuff - Product Reviews, cross-functional updates ("here's what sales/support need to know about what's changed in the product this week") etc. etc.
Been building since ~April this year, we have a few folks using the product but would like to get more feedback. Let us know what you think!