The crafting professions may not yet be implemented in the Wrath of the Lich King beta, but we do get to see their mats. I'm not sure how much we can figure out from them. I do, however, really like some of the names, especially for the gems.
It looks like we'll have the same gem system as in BC, with six colors (three primary and three secondary) and one uncommon and one rare gem for each Epic gems have, understandably, not been unveiled yet, and common gems have made no appearance. Here are the names we have: