Patch 4.2 is going to bring with it a whole new tier of craftable gear, all of it better than the current craftable gear. The ilvl378 gear all takes Living Embers, which are purchasable for valor points and drop from Firelands raid bosses, but the ilvl365 stuff only takes Chaos Orbs. One way or another, everyone is going to be wanting to get this stuff crafted, and that means there's an opportunity for gold makers.
If you can gather or buy the materials, crafting these and selling them on the auction house will likely be a brisk business. If you can't, though, you can still stockpile the mats now (while they're cheaper) and sell them after the patch. Let's look at the different tradeskills that will be seeing some heavier than normal demand.