Patch 3.3 is probably the most highly anticipated update that PvE players have ever experienced. But the list of changes for arena players is also pretty significant. A new season is likely to be just around the corner and some pretty important class changes will be introduced. Here's a quick rundown of some of the most important ones:

Pet

- Pet Resilience: All player pets now get 100% of their master’s resilience.

- Avoidance (passive): Now reduces the damage your pets take from area-of-effect damage by 90%, but no longer applies to area-of-effect damage caused by other players.

General

- Will of the Forsaken now shares a 45-second cooldown with similar effects, including the Medallion of the Horde, Titan-Forged runes, Insignia of the Horde, etc.

- All level 71-80 Battleground daily quests will now award 25 Arena points in addition to their current rewards.

Hunter

- Deterrence: Now also increases the chance for ranged attacks to miss the hunter by 100% while under its effect.

- Intimidation: If the hunter’s pet is in melee range of its target, the stun from Intimidation will now be applied immediately instead of on the pet’s next swing or attack.

Paladin

- Flash of Light: This spell no longer causes a heal-over-time effect unless the player has the Infusion of Light talent.

- Aura Mastery: This effect of this talent has been reduced in duration to 6 seconds.

Priest

- Shadowform: This talent also now causes Devouring Plague and Vampiric Touch to benefit from haste. Both the period length and the duration of these spells will be reduced by haste. In addition, the mana cost has been reduced from 32% to 13% of base mana.

- Vampiric Embrace: This ability is now provides a 30-minute buff that cannot be dispelled, instead of a target debuff and only generates healing for single-target shadow damage spells.

Rogue

- Deadly Poison: In addition to its existing effects, when a rogue applies Deadly Poison to a target which has already reached the maximum number of applications, this will also trigger the poison which the rogue is using on his or her other weapon.

Shaman

- Fire Nova Totem: This totem has been replaced with a new spell, Fire Nova, which is available at the same ranks as the old Fire Nova Totem. Existing characters will automatically learn this new spell in place of the totem. With a Fire Totem active, shamans will be able to use Fire Nova (fire magic) to emit the same area-of-effect damage as the old Fire Nova Totem from the active Fire Totem, not consuming the totem in the process. Fire Nova will activate a 1.5-second global cooldown when used and has a 10-second spell cooldown. The caster must be within 30 yards of the totem to use this ability, but does not need to be within line of sight of the totem.

- Elemental Mastery: This talent now increases spell haste by 15% instead of critical strike chance while active.

- Shaman Tier-9 4-Piece Set Bonus (Elemental): This set bonus now does an additional 10% of Lava Burst’s initial damage over time instead of increasing the size of the Lava Burst.

Warlock

- Conflagrate: Redesigned. This talent now consumes an Immolate or Shadowflame effect on the enemy target to instantly deal damage equal to 9 seconds of Immolate or 8 seconds of Shadowflame, and causes additional damage over 3 seconds equal to 3 seconds of Immolate or 2 seconds of Shadowflame. In addition, the periodic damage of Conflagrate is capable of critically striking the afflicted target.

You can find the complete list of changes on the official site.