Ok , so the new 31 point trees are out on wowhead. Mutilate seems like it will still stand strong for PvP with the ability to spec into a free exposed armor if you have 5 points up. A simple macro could sinc up exp armor and envenom pretty easily, so that as soon as the expose is used an envemon follows. Mutilate and Combat will be the two best spec's for PvE in my opinion. Subtlety is still dead in the water, the thing with the new Sub is that its too focused on bleeds and for any encounter that involves the slightest movement your whole rotation is thrown into disaray.
Im intested to hear any seasoned vetrans opinions on the new trees, as well as try to answer any questions someone might have.