Chromecast for Chrome Browser ?

The only thing that really intrigues me about Chromecast is the feature where it allows you to stream a Chrome tab. In the ad, it seems as though they only demoed it showing a bunch of photos on G+.

Does anyone know if it would allow us to also stream a tab that's running video? For example, would this allow me to stream whatever's on, a video clip anywhere the Verge, or etc.?

If it could do that.....holy #$% that would be amazing!