I am working right now on a Mists of Pandaria guide, similar to the Cataclysm guide I did for the last expansion. Stay tuned for the release to members within a few days.
Stockpiling "classic" trade mats is still a slam-dunk this time around, but I *strongly* advise you to focus on the best blue-chip ("A-list") goods almost exclusively. For example, watch closely right now for bargains on Wool Cloth, Goldthorn, Illusion Dust, Titanium Bars (Titansteel if you can find it cheap) as obvious winners.
Stand by, I'm hard at work