WARRIOR

• Changing stances now has a much reduced cost: you lose a maximum of 20 rage (10 with Tactical Mastery). For example, if you have 100 rage and change stances, you will have 80 rage remaining. If you have 10 rage and change stances, all of your rage is lost. In addition, we may change the penalties associated with some stances.
• You now gain rage when damage done to you is absorbed, such as through a Power Word: Shield.
• Blood Frenzy now causes 2/4% physical damage done.
• Sunder Armor (and similar debuffs) now reduces armor by 4% per application, and is now a single rank. Creature armor has been globally reduced so that debuffed targets should take about the same damage from physical attacks that they did before this change. The net effect should be that this debuff is slightly less mandatory in PvE and is not disproportionately more powerful against cloth targets in PvP.
• We are also adding increased damage to Arms, possibly through Overpower or Slam.
• We are also looking at granting rage when the warrior blocks, dodges or parries.

Read more about the WOW change here.