conclusion:

　　1.spells damage of two hands counted separately,so does critical strikes,that makes the Killing Machine of PPM mechanism less efficient,but the additional rune makes up the shortcomming.

　　2. 3 Threat of Thassarian,formula of off hand damage are similar with main hand's,just less damage.

　　3. 15% off hand damage from talent are counted directly on the final damage,that is:50%*1.15=57.5%.and actual improvement was 7.5%/150%=5% when take the 100 main hand damage into consideration,3 skill point provides 3% hit rating and 5% damage taking.

　　Here's the testing procedure [More]

When talking about balances' PVP,let's start with the most common one-duel

　　1Duel:

　　Recent version(3.1X):

　　surmountables：rogue、warrior、hunter、feral、mage、retribution

　　hard to defeat：priest、warlock、protection pal

　　deuce：holy pal,restor druid/shaman. [More]

we let off informations about that at the last day in June,here's the official Q&A list.

　　Q: Can we change race in same faction? [More]

We made some changes for engineers in PTR 3.2 and will be published in next build,I'm glad to tell you in advance,as usual.Some of the changes may not appear in the next build,so please wait until the 3.2 patch been published officially,here's the Engineering part,and will be appear in the patch note

　Engineering

　　New Mind Amplification [More]

we're trying to reveal some informations,We're developing a new paid service of which allows players changing their character's race because of the fervent requirement.You may shifting to alliance from the horde,or revesed.We still facing challenges,now our goal was changing the character into oppose faction "almost"same with before,on the same server,(means you need pay for immigration). [More]