Hopefully I got the right forum for this, the choice was a little murky.
I recently ran across this sweet little animated GIF. I'm sure it's at least partially a custom job, but if those retractable mounting arms are available as a product, I'd love to know about it. Thanks!
That appears to be a Hidden Vision extended flip-out model. From their site, it can handle up to a 32" display and starts at $748 for the bare mechanism with no TV, cables, or picture frame. They also have a cheaper model that doesn't extend as far.