By request I've collected information for you guys on the new Trade Vendors from the Test Realm. There are two of them, one who accepts Justice points and one who accepts Honor points. You can purchase a variety of goods from them including enchanting materials.
Here is the Justice Vendor with his goodies. In case you can't tell, he's standing to the left of the Justice/Valor vendors:
It's interesting to see how Blizzard values trade goods vs how the players (or markets) value them. On the trade vendor one essence is worth 4x as much as one dust. In my power leveling guides I had them weighted in a 1:3 ratio since a greater essence will break into 3 lesser ones. They also have a heavenly shard priced 50% higher than a greater essence. I would have weighted a shard at double the essence value. And one piece of leather appears to be equivalent to 1 embersilk cloth, though I suspect Tailors might not agree with that one. They also seem to be weighting herbs 50% higher than ore, another surprise. I would have thought them to be roughly equal. Notably missing from the vendor are gems and volatiles. I can't say I disagree with that, really. I wouldn't want to rock the boat on those markets either.
And here's a pic of the Honor Point vendor. Pretty much the same wares and same values, just using honor for currency:
Hehe - I'm terribly sorry! I just couldn't resist using this Amazonian boob shot. This guy is having the time of his LIFE =)