Yesterday on the test realm I saw a couple of people posting uncommon Jewelcrafting recipes in trade chat. I mentioned it to my guild and one of them said he had looted four different recipes while questing in Deepholm. Unfortunately he had already deleted them by the time we had this conversation, because the toon that looted them was not a Jewelcrafter. The recipes are Bind on Pickup, so you can't sell them.
So I went to Deepholm to see if I could manage to get any myself. I spent about four hours questing there and saw nothing. No drop recipes of any kind. Either my buddy has a horse-shoe up his rump or Blizzard hot-fixed the drop rate before I got there. Sadly my Jewelcrafting toon is trapped on a buggy boat to Northrend, but as soon as she's free I'll take her out to Deepholm. It's possible that these new recipes will drop more reliably for an actual Jewelcrafter.
The good news is that I was able to capture a couple of screenshots of the recipes that were linked in Trade Chat. This is all we have for now, but I think it gives us an idea of what to expect. Here are the pics I took:
It's interesting that these gems appear to have a gear level requirement. You can see under the gem name that it says "Requires Item Level: 285". Assuming this change sticks, we can assume that we'll be unable to socket pre-Cata gear with these Cata gems. Personally, I kind of like this change. I wouldn't mind seeing it retrofitted to the older gems either. Right now there's zero market for BC gems and soon WotLK gems will follow suit. By adding a requirement like this, players would still be able to sell older gems instead of vendoring them. Right now BC gems typically sell for less on the auction than their vendor price. That's just sad IMO. It also contributes to people's ability to hoard their epic gear longer when they can socket them with beefier gems.
My guess for these drop recipes is that they will complement the more standard cuts that come from the trainer. We may see more unusual combinations of stats, such as the dodge/hit on the Nimble Jasper above. At this point we don't know how many of these recipes are floating around out there without full data mining from MMO-Champ/Wowhead. I think this find underscores the importance for Jewelcrafting toons to make sure they run content so they can collect these recipes.
As always, feel free to leave questions and requests in the Comments area. My JC/Mining toon is stuck, but I should be able to look into any other queries you might have :)