We have made some updates to the sets in the number values so keep an eye out for them and continue to give us your feedback.

Update:
Mage 2 piece bonus – Hot Streak, Missile Barrage and Brain Freeze grant 12% haste for 5 sec.
Mage 4 piece bonus – Mirror Image is 30 sec and damage bonus is 18%.

Warrior 2 piece bonus – 2 piece bonus – When your Rend and Deep Wounds abilities deal damage you have a 2% chance to gain 20% attack power for 10 seconds.

Druid – Balance 4 piece bonus – Your critical strikes from Starfire and Wrath cause the target languish for an additional 5% of your spell’s damage over 4 seconds.

(Source)