Updated: If you read this post earlier, there were some more hunter changes added to the notes. Updates are in red.
Blizzard just updated the alpha patch notes with a handful of hunter changes and an explanation of their philosophy on adding the new secondary stat attunements which were discovered in the previous build.
Originally Posted by Blizzard
A new concept that we’re introducing is each specialization having an attunement to a particular secondary stat. These take the form of a passive ability that grants a 5% increase to the amount of a specific secondary stat gained. This provides a good starting point for where to focus your secondary stats. Usually, it will be your highest throughput stat (not counting Spirit for Healers, and Bonus Armor for Tanks, which is an optimal secondary stat in most cases). There are exceptions, and raw throughput may not even be the biggest concern in some situations. Treat this as a guideline, not a rule, about which secondary stat to favor.
Update 8/22: This article is still mostly accurate but is slightly depreciated. It will give you a good overview of the overall changes but you may want to view more recent posts under the Beast Mastery tag for more info and recent opinions.
If you missed it earlier, Blizzard released the first version of patch notes for the Warlords of Draenor alpha. I’ve summed up all the relevant hunter info in this post if you want to catch up. I’ve already taken a closer look at both survival and marksmanship, but today we’re focusing on beast mastery.
Overall, beast mastery looks like it’s going to see the least amount of changes in Warlords. Blizzard’s goal with the hunter changes was not to revamp the class, but to give each spec a better identity. Beast mastery already had its own identity as the pet-focused spec, but it looks like Blizzard is aiming to reinforce that even further.