All trade goods available for purchase with Honor or Justice Points from the associated commodities vendors have had their prices reduced by 50%. (more cheap mats will flood the market)
Maelstrom Crystals are now available for purchase with Honor or Justice Points from the associated commodities vendors. (cheaper crystals, woohoo!)
Many pieces of crafted epic armor have had sockets added. (rare gem sales will likely have a short spike this week)
All major cities will now have every type of profession trainer and their associated trade supply vendors. (more convenient training for levelers)
New Cooking and Fishing Dailies have been added to Darnassus, Ironforge, Thunder Bluff, and Undercity. (extra daily quest options for levelers)
Seven new rare items have been added to Archaeology. (I've been saving my Fossil fragments, have you?)
Players now have a much smaller chance of getting a dig site for a race for which they have completed all rare finds. (Thank God! Over half of my dig sites are Fossil right now. Annoying.)
Two more pet collection achievements (Petting Zoo and Menagerie) which should create a boost in pet sales.
Two new Cataclysm food achievements (Cataclysmically Delicious and Drown Your Sorrows) which may give a bump to Cataclysm crafted food sales.
- Glyph of Raise Ally is now Glyph of Death Gate, and makes Death Gate cast 60% faster. (This glyph may become less popular since it loses combat utility)
- Glyph of Rake is now Glyph of Pounce, which increases the range of Pounce by 3 yards. (This glyph may not see much change, both effects are situational and do not increase DPS).
- Glyph of Mend Pet is now Glyph of Lesser Proportion. (This glyph may become less popular since it loses utility and becomes cosmetic in nature)
- Glyph of Frost Armor (This is a NEW glyph with no indication that I've found of the source. My best guess is Northrend research, but check the trainers just in case)
Other changes not in the patch notes :
It appears that the vendor price for cut uncommon gems may be reduced drastically. This could drive the price of these gems down even more since their base value will be much lower.
Noble Hops and Dry Yeast are no longer sold for Cooking tokens and can be bought in unlimited supply with gold. All related markets will likely dry up.
??? - Post in the Comments if you know of other changes that I didn't mention here.