So what's the haps? I'm glad you asked. The usual caveats (it's all still subject to change, it's the beta, don't get too worked up) apply, of course.
Some of this I don't expect to see last very long - Unquenchable Thirst in particular strikes me as an ability that will become wholly abused if it goes live. No cooldown on Bloodthirst? So, what, you just hit Bloodthirst constantly in-between Colossus Smashes? Now, I personally like that kind of rage generation option - it's very Barbarian from Diablo III really, constantly filling up the rage bar. But I don't expect to see it actually get implemented. Still, it's very interesting to see Slam as a talent (even if it is an Arms only talent - frankly I'd like to see fury get a bite of that apple).
Still, arms really is desperately in need of some more attacks, so overall I'm curious and interested.