Patch 3.0.9 (undocumented changes)

A few clarifications and notes on the Love is in the Air Guide and the event in general.

Mage
Arcane Barrage spell power coefficient reduced by ~10%.

Creatures
Flesh Eating Worms spawned from zombies in Duskwood have had their size increased

Mage Glyphs

 * Glyph of Arcane Missiles — Increases the critical strike damage bonus of Arcane Missiles by 25%. (Old - Increases the range of Arcane Missiles by 5 yards.)
 * Glyph of Mana Gem — Increases the mana received from using a mana gem by 40%. (Up from 10%)
 * Glyph of Arcane Blast — Increases the damage from your Arcane Blast buff by 3%. (Down from 5%)

Paladin Glyphs

 * Glyph of Holy Light — Your Holy Light grants 10% of its heal amount to up to 5 friendly targets within 8 yards of the initial target. (Down from 20 yards, Tooltip text fix, was already hotfixed to 8 yards in game)
 * Glyph of Seal of Righteousness — Increases the damage done by Seal of Righteousness by 10%. (Old - Reduces the cost of your Judgment spells by 10% while Seal of Righteousness is active.)

Shaman Glyphs

 * Glyph of Windfury Weapon — Increases the chance per swing for Windfury Weapon to trigger by 2%. (Down from 5%)

Naxxramas
Avoidance and similar effects for pets now work properly on Sapphiron's Frost Aura (Normal / Heroic).

Alchemy

 * Mercurial Stone is now a trinket.

Fishing

 * Newman's Landing is now fishable.

Jewelcrafting

 * Mercurial Stone is no longer required in the creation of Mercurial Adamantite.