Sadly, Amazon didn’t just release a new Kindle that does motion video with embedded audio. But Amazon did just update the content for the Kindle app running on Apple devices, which will give a few books some multimedia.
As an example, Rick Steves’ London Kindle Edition with audio/video features walking tours with Rick narrating. Meanwhile recipe books could feature video tips etc. Unfortunately, right now it looks like there are only about a dozen titles classified as “Kindle Edition with Audio/Video”. Amazon seems to be testing the waters here.