The IGN Video Wall Roadblock is being served from a 970×250 format. It features two video’s. The first video autoplays and auto expands the 970×250 to a 1280×410 slot. The second video is user initiated and expands the ad slot to 1280×720. On collapse the 970×250 is shown with a static wallpaper. Preview
This template consists out of a Billboard and a background wallpaper. This ad unit collapses to a reminder “open button” and while expanding it pushes the content of the website down. You can find a preview of it here.
Yes, that's correct some templates are not available online for diffrent reasons. They are still officially in beta or being re-enginered.