It works really nicely on a phone, you just swipe from the right to access each tweet, videos play automatically. I have noticed that the audio seems automatically off but you just tap on the audio icon on the top right of the screen to turn it up/on. That’s probably a good thing. You can see the audio icon here:
From the phone app you can retweet the Moment but don’t see an obvious way to find an embed code from a device. Today I see a handful of “Moments” and they don’t stay up all day. It’s an interesting idea and I suppose we’ll see who likes this and who doesn’t. For News Nerds this should make them very happy.