If you wanna have a preview at this update 3.1. Be yourself with them on PTS.
Gold is the ultimate fungible commodity. Start doing those lucrative dailies. There's a lot of new stuff coming in 3.1 and you'll need a bit of jingle in your pocket if you want to buy the hottest items right away. As with every expansion, prices will soar for whatever is considered the latest and greatest. And all this new equipment will take gems and enchants. Then there're glyphs for dual specs. You'll want to have a reserve of gold on hand when 3.1 goes live and gold doesn't take up bank space.
Uldar is bringing a ton of upgrades and as folks slot in 226 level trinkets, the value of the Je'Tze's Bell and Greatness trinkets will drop. As players secure higher level items in Uldar and new higher level BoE items appear on the auction house, demand for the current crop of BoE items will fall precipitously.
The yield from herbing will increase in 3.1. Herbalists will be able to put in less time to yield the herbs they need for elixirs and flasks or to sell on the auction house. The value of your stockpiled herbs is likely to plummet for this reason alone, especially for those herbs used to make elixirs.
In 3.1 the time span on flasks will cut in half. This will allow players more ability to customize their use of flasks. The Flask of Pure Mojo (+38 mana/5) may gain in popularity over Flask of the Frost Wyrm (+spell power by 125) as healers face new mana issues in 3.1. Elixir masters who used to see 2 to 3 extra elixirs or flasks per stack created will now see 3 to 6. Overall I see a wash for Alchemists: cheaper herbs, larger yields, increased usage coupled with increased supply.
Skinning/Leatherworking, Mining/Blacksmithing & Tailoring
The tailoring patterns are confirmed to be rare Uldar drops, but Wowhead did not indicate how the more numerous 3.1 blacksmithing and leatherworking patterns are obtained.
The Blacksmithing patterns all required Titansteel bars, Eternal Earth and Saronite bars. The Leatherworking patterns all required Heavy Borean Leather, Arctic Fur and Icy Dragonscale. The Tailoring patterns required either Moonshroud for healing oriented armor or Spellweave and Ebonweave.for cloth armor with hit rating. Ebonweave, Moonshroud and Spellweave are made from Frostweave cloth, Infinite Dust, and Eternal Fire, Eternal Life or Eternal Shadow, respectively.
Everyone will be upgrading their armor and weapons as they venture into Uldar. New armor and weapons means new enchants and gems on a regular basis until a significant number of folks have maxed out many of their characters with the new best-in-slot items.
As for Inscription, folks will need tons of new glyphs initially. Changes to the various classes, new glyphs and dual specs should drive the prices of glyphs to the moon. Start stockpiling those glyph mats now!
Meat and Fish
Fishing just got more attractive. It will be easier to level, since you'll be able to fish anywhere regardless of skill. You have a new daily fishing quest, which yields some very nice rewards. Fishing is being added to the Wintergrasp battleground. All the fish needed to create the Fish Feast used to buff raids will be obtainable in that one location. All these factors should increase the numbers of fisher folk and make the fish needed for the Fish Feast (glacial salmon, mussleback sculpin and nettlefish) easier to obtain. More fisher folk and easier to obtain fish for the Fish Feast will likely mean a decline in demand for these fish. Demand for meat and other types of fish should see a slight increase as players more consistently eat food to maximize their stats for the new, more challenging content.