• Mushroom Chair, reported to be sold by a vendor after completing several stages of the new Firelands daily quests: Introduction, Druids of the Talon and Shadow Warden, then Filling the Moonwell – more details.
• New faction-specific achievements for the daily quests added in patch 4.1, plus a meta achievement for completing all 3 sets of achievements – Alliance guide/Horde guide.

• FAQ for basic information and questions.
• The Limnologist and The Oceanographer achievements.
• Catches in Cataclysm zones and changes to Old Azeroth.
• Fishing Pool of Fire for Volatile Fire.

Testers may also be interested in the fishing bug/quirk list.

• “Realm First! Illustrious Angler” – first to 525 fishing skill on your realm. Regular achievements are also available to everyone for reaching the maximum skill in each rank (not simply learning the rank, as in WotLK).
• “The Limnologist” and “The Oceanographer” for catching almost every common freshwater (inland) and saltwater (coastal) fish (full list).
• “Fish or Cut Bait” for completing the new Azeroth Daily Fishing Quests.

And more…

• 3 guild achievements for pool fishing – 10,000, 50,000 and 100,000 catches from pools (across your entire guild, not per member). The easiest achievement (“That’s A Lot of Bait” for 10,000 catches) is required to unlock the recipe for Seafood Magnifique Feast – perfect raiding fish-food.
• Update: The Deadliest Catch becomes a Feat of Strength (likely historic, so impossible to gain with Cataclysm). It will not be required for Salty.

• 5 new fishing daily quests in Dalaran. Rare rewards include new poles and minipets. Full details.
• Lake Wintergrasp now contains fish.
• Borean Man O’War gain a cooking recipe (Black Jelly, uses 3 fish, restores 18,000 health and 15,000 mana). Trains at cooking skill 400.
• New +25 Nat’s Lucky Fishing Pole reward for the Artisan fishing quest (or given by Nat if the quest was already completed).
• 5 new fishing bobber designs and 3 new fishing pole designs. At least 2 poles come from the daily quest. More discussion.
• Achievement One That Didn’t Get Away can also be completed by catching Mr. Pinchy, Old Crafty or a “Baby Coralshell Turtle” (source unknown). “May be a bug” (Bornakk). “No plans” to buff drop rate (Bornakk).

More minor changes listed below.

• Bobber splash noise has changed. (MP3)
• Northrend pools are slightly easier to see.
• References to dwarven fishing techniques have been uncovered, such as “Fishing Hole Explosion – Causes a fishing hole to explode, scattering fish around the area”. Use unknown.
• Icons for certain achievements have also changed.

The change to One That Didn’t Get Away is not retrospective: Even if you have the Crawdad and Crafty achievements, you will not gain One That Didn’t Get Away automatically.

For a detailed, illustrated guide, read Patch 3.1 Changes.