The official Google AdSense blogspot reports:
Over the next few weeks we'll be testing AdSense video distribution and sponsorship with a small group of publishers. You may remember us doing a similar trial last year with MTV Networks, where we distributed ad-supported MTV video content to publishers who displayed the content on their sites. This time, we'll be working with a larger set of content providers, grouping together video content from providers such as Warner Music Group and Sony BMG Music Entertainment together with quality ads and offering them as playlists which publishers can select from and display on their AdSense sites. Participating publishers range from small to large, and cut across many different types of content.
Some time ago we reported Google and Viacom's MTV Networks to Test. Now it is evident that the tests were successful.