Based on feedback in this thread about particular engineering items and schematics, we've made a few additional changes we'd like to share. Bear in mind again that this information is subject to change during the 3.2 testing process.

• World Enlarger: Cooldown is now 15 minutes, down from 1 hour.
• Mind Amplification Dish: A passive bonus of 45 stamina has been added to this tinker.
• Nitro Boosts: Passive bonus is now 24 critical strike rating.
• Frag Belt: The cooldown is now 6 minutes, down from 10 minutes.

On the current PTR build, there is a bug with the proc code itself causing it to behave strangely. You are likely to see bugs on the PTR with anything related to procs. This includes talents such as Art of War, etc.

There is an unrelated bug with Ardent Defender that makes Prot paladins more and more survivable as their health approaches zero such that it is literally impossible to kill them... though Chaos Bolt might work.

Take any balance issues on the current build with a grain of salt. We will try to get a new PTR build up soon(tm).

Stonekeeper Shards quest rewards and achievements
It is intended that the quests that provide Stone Keeper's Shards don't count toward the achievement as the goal is to get the achievement by looting them. Yes, the text in the achievement could use an update which we may do in the future, but I have no eta on when that may or may not happen. (Source)

Allowing Engineers to change specs
It's definitely something we'd like to do. We'll let you know when we can provide a better answer than this. (Source)

Warrior (3.1 Skills List / 3.1 Talent + Glyph Calc.)
Warrior Mechanics

There are some mechanics we'd like to change with warriors, as I have already stated. Having to spam Heroic Strike is definitely one of them. Rage starvation is never fun (which is not the same as "I can ignore rage.") This is a slightly different argument that whether or not warriors have the stats they need to do the job, which seems to be the bigger concern in this forum at the moment. I am personally not particularly interested in who is the "easier" tank. I don't think any of them are significantly different from each other. You still have to know when to use your cooldowns, when to swap your gear, how to coordinate with your raid and when it's you that's the problem and not your class.

I think it's easy to argue against your point that warriors have not gotten a pretty hefty overhaul this expansion. We changed the warrior Protection tree a lot more than the paladin Protection tree or the Feral tree. We made you press Shield Block less often and Shield Wall more often. We changed Thunderclap and Devastate and Shield Slam and so forth. My point here is: don't dilute your arguments. I hear a lot of players saying that warrior survivability is lower than other tanks. Okay, that is feedback we can use. I hear them saying, as you did, that some of the mechanics still need to be updated. That is feedback we can use. Saying you are neglected or somehow other tanks got more changes than you or whatever... that is hard to use. We don't balance around "neglect." We balance around numbers. Theorycrafted numbers and simulations are valuable. Actual encounters with a boss are even more valuable. (Source)