It looks like they are allowing all your normal skills, plus giving you PvP skills that will unbreak the game-breakers, i.e. instant recovery from sleep, probably stun resistance, heavy shake-off, etc.

Wolves Den looks like basically a training ground for frontlines. And gosh darn frontlines look so awesome and fun. I think this game is going to evolve into something extremely special if people are willing to immerse and enjoy the small things as they come.