Blizzard’s 9 November hotfixes raise dungeon experience by 50%, ease the Deathless Marrow encounter and fix bugs across eight classes. Player population drops in crowded zones, most on the PvP ruleset.
Anyone leveling through dungeons gets 50% more experience from every kill there. The Drowned City and the Deathless Marrow encounter also hit and take less.
Non-Destruction Warlocks lose Incinerate, and Arcane Concentration now splits its chance across the cast and every bolt; the post does not give the new chance. Cooldown Manager users on Druid, Paladin and Warrior get corrected displays.
Every enemy kill in a dungeon now gives 50% more experience. The Drowned City needed two repairs: its creatures were doing about 30% more damage than intended, and the Deathless Marrow encounter was tuned down. Its creatures have 25% less health, the Deathless Sorcerer’s Fireball does 25% less damage, the Deathless Watcher’s Charge does 50% less, and the Deathless Guardian casts Shield Slam about half as often.
Blizzard also lowered the number of players in zones with heavy congestion. The cut is larger on the PvP ruleset, where players said several zones felt overcrowded, and Blizzard says it will keep watching and adjust.
Warlocks lose access to Incinerate outside Destruction and now get the right riding skill from the Summon Felsteed quest. Players who finished that quest earlier get apprentice riding by summoning the Felsteed once. Hunters get two fixes. Vulgara the Insatiable and the Shrieklings of Zephras move to the correct pet families, and targeting an enemy from very far away no longer aggroes it. Shamans get a corrected Lightning Overload damage for Lightning Bolt. Cooldown Manager fixes cover Druid (Berserk gone, Lacerate shown), Paladin (Seals) and Warrior (Thunder Clap shows only its cooldown).
The rest is a long list of small repairs. Zarla Ober in Alcaz Prison and the three Shaper's Terrace creatures Vitrix, Snowtalon and Cinder now drop loot, and Heart of the Mountain in Blackrock Depths can be looted more than once. Waylaid Crates and Craftsman's Writs can drop inside dungeons. Berdun's Trusty Rifle loses its random stats and its Bind-on-Equip flag. Fifteen quests are repaired, from group-shared quest items to broken escorts and doors. In Warsong Gulch an invisible wall that blocked the Alliance base roof is gone.
The player population is lowered in zones with heavy congestion, by more on the PvP ruleset after players there reported feeling overcrowded. Blizzard will keep watching and adjust.
Changed
Camp Taurajo flight path
The route to Thunder Bluff could pass through objects; fixed.
Kaivax
Fireball and 
Charge hit softer
Arcane Concentration now splits its chance across the cast and every bolt, and 
Incinerate is Destruction-only
Warlocks lose 
Druid, 
Paladin and 
Warrior get corrected displays.
Shield Slam about half as often.
Feral Charge (Cat) now puts the Druid in combat at once, 
Natural Instinct applies to 
Lacerate and 
Pounce, and the 
Mages stop wasting Clearcasting on 
Flamestrike's ground ticks, and 
Priests can cast 
Fear Ward without breaking 
Shadowform, and 
Power Infusion persists on allies.
Destruction and now get the right riding skill from the 
Summon Felsteed quest. Players who finished that quest earlier get apprentice riding by summoning the Felsteed once. 
Hunters get two fixes. Vulgara the Insatiable and the Shrieklings of Zephras move to the correct pet families, and targeting an enemy from very far away no longer aggroes it. 
Shamans get a corrected 
Lightning Overload damage for 
Lightning Bolt. Cooldown Manager fixes cover 
Thunder Clap shows only its cooldown).
Ferocity
Cat Form version did not put the 
Consecration
Lightning Mastery
Improved Ghost Wolf
Dash, 
Blink, 
Sprint and other movement abilities; fixed.
Rogue quest was much less possible than intended; fixed.
Cultivation
Tauren
Arms
Arcane
Protection
Discipline
Retribution
Enhancement