I wish I were in the Beta so I could see how these work. For the most part, my favourite thing are the new mastery abilities you get when picking your spec; Felguard, Starsurge, Pyro, Water Elemental, etc. Though, it's kinda weird the talent tree still has Starsurge on it, even though druids supposedly get it for picking Balance. Unless it's different on Wowtal, which isn't working for me.
Oh well. I've always been solidly in the 'fun-having' category, rather than the 'games are serious' one, so I don't really have a good grasp on all the changes just yet.