First off bags will be needed, I currently have about half a bank full netherweave bags and a few frostweave bags. I plan on having an entire guild bank full of bags come Cata launch.
Glyphs is going to be the largest money maker come expansion, there will be a huge demand with all the new characters. I am going to have inscription maxed out this week and will work on obtaining glyph masterys. I want to have a very large stock pile going into Cata.
With jewelcrafting I am going to forget about epic gems. I believe that most players will ignore epic gems since they will only have new gear for short periods of time while leveling. I believe the money will be made in rare and uncommon gem cuts. With prices declining in raw gems these should be easy to stock pile.
BoA enchants are going to be a big seller as well. Here are the ones I plan on stock piling, Boots - Minor Speed, Chest - major health, Chest major mana, weapon crusader, weapon - fiery, & Chest - greater stats. Weapon - Spell Power & Healing Power are very difficult to get but do work on BoA.
If you are a blacksmith, of course focus on belt buckles.
Thanks for checking in!