Dan O'Halloran of Massively.com spent some time with Age of Conan at CES in Las Vegas, Nevada and came away with some amateur video of the Barbarian class in action as well as a bit of a write-up on what to expect from the class.
Barbarians have two specialty Feats trees: Berserker and Reaver. One of the cool abilities I saw in the Berserker tree was No Escape: Throw your weapon to impale the enemy, causing massive damage and stunning him. Disarms you. I wasn't able to train Feats in the demo, but if I could, that would be the one I'd like to try.
Another ability I saw was in the Reaver tree. Armageddon Falls: For the next 12 seconds you have a 100% chance to proc a debuff on your opponent that will do additional damage. How much damage? I don't know, but it was fairly deep in the tree, so I'm guessing it's the "who wants to see a blood bath" key.
Grab the full preview here.