Classes Nerfed:

• Death Knight

  Frost Presence: Armor bonus is now 60% down from 80%.
  Death Knight PvP Gauntlets: The chance to refresh a Frost Rune when casting Chains of Ice has been removed. When equipped, these gloves now generate 5 additional runic power whenever Chains of Ice is used

• Paladin

  Eye For An Eye: This talent now deals 5/10% of the critical strike damage taken by the paladin back at the attacker.
  Hand of Freedom: The base duration of this buff has been reduced from 10 seconds to 6 seconds.

• Druid

  Improved Barkskin: This talent now also grants 80/160% additional armor while in Travel Form or not shapeshifted.
  Improved Tree of Life: The armor bonus to Tree of Life Form from this talent has been reduced to 67/133/200% bonus armor.

Classes Buffed:

• Hunters

  Hunter's Mark: The ranged attack power bonus from this ability has been increased from 300 to 500.
  Master Marksman: This talent now also decreases the cost of Aimed Shot and Chimera Shot by 5/10/15/20/25%.

The changes listed above are not 100% of the patch changes, only information that relates to something in the arenas.