Fmulder points us to a news item on Blizzard’s site about an update to their art gallery. It includes four images, but as usual, we’ve had three of them for months (or years). So no, the Tomb Viper by Brom, the Blizzcon 2009 Barbarian poster pose, and the Skeleton King painting are not new.
Happily, this Barbarian artwork, by Phroilan Gardner, is new, at least to our jaded eyes. (But not chronologically new, as Phroi left Blizzard in 2010.) Is he not mighty? Click it for a much larger view.