For those who haven't heard, WotLK is now officially in Beta. With it, the NDA has been lifted and the talent trees for all classes are available online. From what I've seen of classes I know, Blizz is going all out to refine every tree of every class and make each one have something to offer.
Using the Rogue as an example, Combat continues to be the ultimate PvE DPS tree with insane new talents like Murder Spree and Fan of Knives. Subtlety is the "best" PvP spec but what they've done is create new abilities in the Assassination tree that make it an extremely viable PvE/PvP hybrid tree.
So, chat up your Beta goodness here!