From what I've been reading on Elitist Jerks is that BM is still out in front dps wise and MM and Surv in a tie for second place. I know our shot rotations are changing in WotLK and I'm not sure yet what the optimal BM rotation is gonna be. I know the goal of both MM and Surv is to get enough haste so that Steady Shot's cast time is down to 1.5 sec so that it matches the GCD. After that rotations become Serpent, Explosive/Chrimera, Steady, Steady, Steady, Steady, Explosive/Chrimera, Steady, Steady, Steady, Steady.
Also Surv was cleaning up at one point cause of Lock & Load which was giving you 3 free Explosive Shots. That is currently been reduced to 1 free, but is supposed to be bossted to 2 free ES. With 2 free ES, Surv should pull slightly ahead of MM but still be behind BM.
Now dont get me wrong I love Surv and my main hunter has been Surv for a long time (aside from going BM to lvl). Thanks to the changes though Surv has some new issues in that some of our cc has been reduced in pve. The new Trap Mastery talent, while very useful in pvp is now virtually useless for pve. I personally loved being able to chain trap forever by hitting Scatter Shot and tthen dropping a trap 3 sec later, even after the whole overlapping trap timers had ended. Now Surv is on the exact same timer as every other spec trap wise (I never see anyone taking Resourcefulness and sacrificing the needed dps). If they made Resoursefulness 1 talent point and put it lower on the talent tree it would be doable but its definately not worth sacrificing 3 talent points for.