Here's the list with the possible changes in the upcoming WoW 2.4.2 patch. Mostly fixes for arena points calculations.
The latest patch notes can always be found at http://www.worldofwarcraft.com/patchnotes/
The latest test realm patch notes can always be found at http://www.worldofwarcraft.com/patchnotes/test-realm-patchnotes.html
Druid
- Talent: Primal Fury (Rank 2) will now be properly unlearned when it is
untalented.
- Talent: (Restoration)- Natural Perfection will no longer proc by normal
melee attacks.
Hunter
- Aspect of the Viper: This ability now grants an additional amount of mana
each 5 seconds equal to 35% of the hunter's level.
- Boar Charge: This ability will no longer make Growl cast immediately after
it generates excessive threat.
- The pet ability Growl will no longer scale with pet Attack Power.
- Dire Ravens in Blade's Edge Mountains now tameable.
- Scare Beast: The range on this spell has been increased to 30 yards and it
is now instant cast.
- Tamed Drywallow Snappers now will know Bite 5 (instead of Claw 5.)
Mage
- Talent: Improved Blink (Arcane) now reduces chance to be hit by 13/25% and
the duration of Rank 1 has been increased to 4 seconds.
- Completing the quest "Arcane Refreshment" will now properly teach the spell
Conjure Water (Rank 7).
- Polymorph: Mounted creatures will no longer remain mounted while
polymorphed.
- Mage Armor no longer reduces the duration of beneficial magic buffs.
- Molten Armor will now do damage while a damage absorption shield is active.
Paladin
- Flash of Light and Holy Light will now work properly with castsequence
macros.
- Seal of the Crusader: This ability now increases the damage dealt by
Crusader Strike by 40%.
- Crusader Strike (Retribution) will now properly receive a damage increase
from Seal of The Crusader.
- Talent: Precision (Ranks 1-3) will no longer improperly display daggers and
staves as a weapon class in the tooltip.
- Paladins that already have Apprentice Riding skill can now properly learn
Summon Warhorse from the trainer.
Priest
- Fear Ward will no longer be consumed while under the effects of cyclone.
- Mana Burn: This spell can no longer trigger effects that require the target
to be struck with a critical hit.
- Power Word:Shield now has the correct sound associated with it and can no
longer be heard from large distances.
- Talent: Power Infusion will now consume the correct amount of mana when cast
on yourself.
Rogue
- Ability: Blade Flurry: This ability can no longer hit critters as its
secondary targets and will now use a proper range calculation for all secondary
targets.
- Talent: Mutilate (Assassination) will no longer incorrectly appear multiple
times in the combat log when used.
Shaman
- Ability: Frostbrand Weapon: Rank 6 damage has been increased very slightly.
Warlock
- Drain Soul: Channeling of this spell will now always stop when a player
target dies.
- Pets: Using a sacrifice effect to kill your own pet will no longer trigger
effects that should only occur when killing an enemy.
Warrior
- Sweeping Strikes: This ability can no longer hit critters as its secondary
targets and will now use a proper range calculation for all secondary targets.
Items
- Brann Bronzebeard's Lost Letter: This item will no lonber display a damage
range in its tooltip.
- Crusader's Scaled Battlegear: Tooltip spelling corrected.
- Elixir of Demonslaying: This elixir now grants ranged attack power against
demons as intended.
- Hazza'rah's Charm of Healing Haste rating reduced.
- Nightfall now has a chance to fail on targets over level 60.
- Ravager: Judgements will no longer auto-refresh and break the effect from
this item while its effect is active.
- Renataki's Charm of Trickery has had its energy reduced.
- Shard of Azzinoth no longer shares any cooldown with Shaman Elemental
totems.
- Shattered Sun Pendant of Might: The triggered effect from this item will no
longer break Scattershot or other crowd-controlling affects. The visual on the
Scryer version has been updated.
- Shifting Naaru Silver: Using this item no longer puts players into combat.
- Silithyst Dust: The bonus from turning this item in no longer works for
players above level 63.
- Ten Storms Set: The Chain Heal bonus from this set has been reduced by 5%.
- Wushoolay's Charm of Nature Haste rating has been reduced.
PvP
- Arenas
- If a character's personal rating is more than 150 points below the team
rating, they will earn points based on their personal rating instead of the team
rating.
- If the average personal rating of the players queuing for a game is more
than 150 points below the team's rating, the team will be queued against an
opponent matching or similar to the average personal rating.
Professions
- All 23-hour profession cooldowns are now 20-hour cooldowns.
- All 4-day cooldowns are now 3 days, 20 hours.
- Enchanting
- Removed the cooldown from Void Shatter.
- Void Shatter recipe now correctly requires 375 enchanting.
- Engineering
- The Engineering supply item Delicate Copper Wire will now properly fit into
engineering bags.
- Jewelcrafting
- Brilliant Glass no longer requires a forge.
- Brilliant Glass now has a small chance to make an epic gem.
- Quick Dawnstone, Reckless Noble Topaz, Forceful Talasite are now all
available at the Quel'danas gem vendor.
- Leatherworking
- Completing the quest "The Journey Has Just Begun" will now properly teach
how to make an Onyxia Scale Cloak.
- Greatly reduced the reagent cost for Glove Reinforcements. Also reduced the
skill gain range slightly.
Quests
- The categories for the quests "Wanted: Sisters of Torment" and "Wanted: The
Signet Ring of Prince Kael'thas" have been fixed to now properly read as
Magister's Terrace.
- The Shadowy Disguise will no longer be applied to druids while they are in
Moonkin or Tree of Life form for the quests "Who Are They?"
- Jailor Eston and Jailor Marlgen for the quest "The Rescue" should now
respawn more frequently.
- more minor fixes can be found on the official website -