I highly doubt that Blizzard would go to all the effort to revamp the human model for this commercial, but I could be wrong. They mentioned that race revamps will be coming sometime in Mists of Pandaria to bring all of the models up to the polygon count and graphical level of the Goblin and Worgen models. After all, some of the old World of Warcraft race and animal models are starting to look a bit incongruent with the Mists of Pandaria environments and even some of the Cataclysm armor.
Could this be our first hint at the new human model, which is largely less caveman-like in appearance? The human model featured in this commercial has detailed facial features, looking a bit less blocky than the human model currently featured in game.