Why yes, that is Clancy "The Kurgan" Brown as Thrall. The trailer is from the never completed Warcraft Adventures game, and it's always gotten me thinking that the Warcraft setting would have made an excellent cartoon. You could see it working in several styles - a Bruce Timm or Greg Weisman style ensemble show ala Justice League or Young Justice, an homage to Filmation style shows like He-Man or Tarzan (I'm probably the only person alive who really liked the Filmation Tarzan) - I just think, with a Warcraft movie coming out that a cartoon could work.
And man, get Clancy Brown to just do everyone. Especially Jaina. No, not especially Jaina, I actually think Laura Bailey does an excellent Jaina. But I would laugh hysterically at Clancy Brown's version.