The patch notes for the patch 4.3 PTR have been updated as of today with a smattering of class nerfs, buffs, and balance fixes. Of note: generous buffs to fire mages and destruction warlocks. These are only the new additions; check out the full notes when you're done perusing the new stuff.

Death knights

• Unholy Might now increases Strength by 25%, up from 20%.

Druids

• Bear Form now provides an armor bonus of 120% at all levels, up from 65% for characters below level 40, making it easier for lower level druids to tank dungeons.

Hunters

• Animal Handler now increases attack power by 30%, up from 25%.
• Explosive Shot damage has been increased by 15%.

Mages

• Pyroblast's initial damage has been increased by approximately 26%, and its damage over time has been increased by approximately 100%.
• Fireball damage has been increased by approximately 17%.
• Living Bomb damage over time has been increased by approximately 10%, and explosion damage has been increased by approximately 120%

Priests

• Guardian Spirit's healing bonus has been increased to 60%, up from 40%.
• Holy Word: Serenity now has a cooldown of 10 seconds, down from 15 seconds.

Warlocks

• Soul Fire now scales with 72.6% of spellpower, up from 62.5%.
• Impending Doom is now also activated by Soul Fire.
• Cataclysm now increases Fire damage by 30%, up from 25%.
• Fire and Brimstone now increases the damage of Incinerate and Chaos Bolt on Immolated targets by 5/10/15%, up from 2/4/6%.
• Burning Embers now deals damage equal to 25/50% of Soul Fire and Imp's Firebolt, up from 15/30%.
• Burning Embers damage cap has been raised.
• Shadowburn now deals Shadowflame damage, instead of Shadow damage.
• Improved Soul Fire now lasts 20 seconds, up from 15 seconds.

Warriors

• Charge (and related abilities) should now correctly path to a target even if the target moves during the Charge. This change should decrease the likelihood of the warrior Charging to a different location than the target.
• Slam now uses a new character attack animation.
• Colossus Smash now uses a new character attack animation.
• Dual Wield Specialization no longer increases physical damage by 5%. It continues to increase off-hand attack damage by 25%.