The newest playable Vault Hunter in Borderlands 2 is now available today, Krieg, the Psycho Bandit. Sir Hammerlock is here to brief you on everything you need to know about him. He can also be purchased for $9.99 on Steam and the PlayStation Network or 800 Microsoft Points on Xbox 360. It'll be available later today on PSN in North America and tomorrow in Europe on PSN.
It's worth noting that Krieg the Psycho isn't part of the season pass.