I've been perusing the profession changes on the PTR - most of them you already know about if you follow MMO-Champion. There's one item that hasn't gotten much play and that's the new Glyph of Dark Succor. I'm seeing some speculation about this new glyph recipe that I wanted to lay to rest. I can confirm that this is currently learned from the trainer. You can see in this screenshot that it's available at 275 skill:
I can't say for sure what the market potential of this item is - I don't play a Death Knight. Since it comes from the trainer, it's likely that it will go down in value pretty quickly. Those of you who are interested in cashing in on this should get your ethereal ink stockpiled and be prepared to crank these out as soon as the patch goes live.
Personally, I'd love to see a few more Inscription items added to the mix. Other professions are getting some love in this patch (Alchemy, Jewelcrafting, Enchanting) and Scribes could use some additional market goodies. If nothing else I hope they implement the Origami Beetle that's been floating around the rumor mill.