I've been doing a little bit of research on some of the crafting cooldowns for Blacksmithing, Tailoring and Leatherworking for patch 5.4. I thought this might be helpful for people looking to keep up on their CDs when the patch releases because it looks like we will be learning the new pvp recipes via the daily CD method which will provide some gating to what items are available on the AH.
Blacksmithing - Balanced Trillium Ingot - requires 1 trillum bar - this could apply some upward pressure to the prices of GIO and trillium bars on the AH. Building a stockpile of trillium might be helpful to keep up on your daily research and/or to gouge on prices for people trying to keep up on their daily CD. The new pvp recipes also require more GIO to craft than in 5.2.
Leatherworking - Hardened Magnificent Hide - requires 2 magnificent hide - building a stockpile of magnificent hides to keep up on your daily research for the pvp patterns could prove useful. Also, having enough hides to craft the new pvp gear will be important to cash in on the pattern exclusivity you might have during the first week. The new recipes also require 2 & 3 magnificent hides rather than 1-2.
Tailoring - Celestial Cloth - requires 10 bolts of windwool cloth - on my high-pop server the tailoring pvp cloth market isn't amazing and there always seems to be cheap windwool cloth on the market. That being said, every realm is different and with more and more people looking to cloth to shuffle for cheap enchanting mats the prices could go up for a short period of time. Goblins will be looking to craft both pvp gear and create enchanting mats for the gear explosion that could occur during 5.4 with flex raiding implemented and a new 14 boss raid.
I hope this is helpful in terms of deciding what might be useful to stockpile. I don't advocate stockpiling mats just to sell back at high prices (although I'm sure this has created wealth for many goblins) rather stockpile cheap mats now so you can perform your CDs and keep up with crafting during the first few weeks of the patch.