My suggestion is try the other trees and different pets it cannot hurt and you may find another tree suits your style of play better , but of course it will cost you some gold for trying out different things , at least when you first get on the respec is free.
We are all in the dark with all the changes , my guess is in a few weeks someone will come up with the way to level and the fastest spec for each tree and what is a good selection of pet choices and their talents , i am at the moment getting all my hunters different pet families and i can see some pets will be good for a MM or Survival hunter , at the moment i am trying to decide which hunter tries the other trees out so i will be trying all 3 trees out where before i was pure BM.