My experience is the same as R. C.'s. It seems as if the announcement may have gotten ahead of the actual implementation. We'll have to wait until the creation option actually appears on our dashboard to see what happens.
That said, in recent days, I have seen videos in my search results. For instance, when I was researching astrology for an upcoming book, I noticed a very showy video, including a nice clip showing planets revolving around the sun, as an ad for one of the books. I've also seen a couple for fantasy books. Ah, I just tried a search for fantasy, and there's a video on page 1 of the search results for Cadwell Turnbull's We are the Crisis (Blackstone Publishing). So evidently, the trads can already do this. I've always been an advocate for indies having the same ad options as trads. Oh, and the bottom of the product page under related books has two books represented by videos. Both of them are trad books with thousands of ratings on both Amazon and Goodreads. The Turnbull book is a recent release that has starred reviews from Publisher's Weekly, Kirkus, and Library Journal. In other words, these are books that probably didn't need a video ad boost, but in all three cases, publishers chose to give them one. Maybe they know something that we don't.
My experience with AMS ads hasn't exactly inspired confidence, either, but video does have some potential to change the game. We still have that instinctual tendency to have our attention drawn to something which moves. (If you doubt this, have a conversation with someone in a room with a TV running. Even if there is no sound, the other person's eyes will tend to drift in that direction.) There is considerable evidence that video ads can have greater impact that static ads.
Of course, it also takes time and effort to make video ads. I have two good trailers that I could use when the option becomes available. But it might be better to make one specifically for this advertising, in which the sound is off by default. (One of my existing videos depends on audio narration, but the other has captions.)
