Also of note for this expansion compared to previous ones in terms of money-making:
Everything is just worth less, generally. Kind of unfortunate, but professions are ridiculously easy/cheap to level, possibly the easiest tier in the entire game. No one is really making gobs of money right now except maybe scribes cashing in on the Darkmoon Faire madness.
Just to give a couple examples:
Enchanting: Utterly Worthless. Up/Down Conversion of every mat means that they're all equivalent in price. Huge abundance of materials due to the leveling process and the guild perk everyone should have at this point. Shado-Pan enchants will be worth something due to requiring a decent amount Sha Crystals (which are a daily CD for up-conversion) and being locked behing the rep grind, but still not too much.
Alchemy: Living Steel not really worth it anymore, margin is too low, even converting from ghost iron. If you proc it's nice, but otherwise you're really just breaking even or making a about 100-200g at most, which really isn't worth the investment . Gem transmutes aren't even close to being profitable, which is unfortunate. Golden Lotus still costs more than gems (cut or uncut) themselves, making it a losing proposition. Primal Diamonds may be alright, but not as stable a market. Flasks - also reliant on Golden Lotus - not the best market to be in. May be biased here for MoP, but it was a pointless market in Cata thanks to the guild cauldrons. Potions and Elixirs never really sell well, so I don't even bother, not being specced into either.
Jewelcrafting: Just generally worth less. Taking only one day to discover a cut, rather than 3 (albeit getting a random one) makes cuts less valuable. Green gems are nigh worthless, with transmutes not being profitable, and enchanting mats in the shitter (Jewelry -> DE). You can cut and hope for perfect cuts, but that's a lot of vendor waste. Metas seem alright, as mentioned, but still not particularly strong.
One thing I've noticed for free money is Blacksmithing. Buy Living Steel, make Belt Buckle , ???, 500g profit. Not sure how fast those move, but it's got to be some of the easiest gold at the moment.
Other professions I'm either not as in tune with, or don't care to rattle on about at this time.