Plan on making a Pandaren? Plan on leveling his professions, so that you can make all kinds of face-melty gold at the beginning of the expansion? You'll need some mats for that.
Whether you want to stockpile them for launch-day, use them to level your current professions, or just try your own luck on the AH either now (wouldn't recommend it) or when the expansion hits (would recommend it)!
I also might be willing to create some Alchemy leveling packs. That is, a set amount of every single herb that you'll need to level your Alchemy from 1-525. I trade it to you all at once, and after about 30-45 minutes, you have yourself a max-level profession. I advise this, because as with every expansion, Alchemy can make a LOT of gold from day 1 just selling your transmute cool-downs.
If you'd be interesting in buying a 1-525 Alchemy pack, or any large bulk of herbs or ores (and yes, I'll mine the WotLK and BC ones if you want them in bulk too), go ahead reply to this thread, or send a message via in-game mail, to Bokono, on Bloodhoof, Horde Side.
Thanks guys, and good luck with your money-making endeavours in the coming weeks before and after launch-day!