Some very interesting information datamined from today's PTR update.
(As always, all of this is subject to change. We never know if these will hit live or not until the patch actually arrives.)
Blacksmithing - a lot of new patterns added that are labeled "Training Projects" and appear to create non-useful items. Sounds to me like a way to level up Blacksmithing from the start using the newest materials. If true this will be great for those times when you hit a particular plateau where the AH is dry of the materials you need. Will be interesting to see if they go with this and possibly add more later for the other professions.
Serpent's Heart - A new daily CD combining three Serpent's Eyes into a container of some sort, no clue yet what can be in it.
Looks like JCs will be gaining a way to create their own Primal Diamonds as well, but very costly. Requires 5 each of the uncommon gems and a Spirit of Harmony.
Leatherworking gains the ability to create a Magnificent Hide out of 20 Exotic Leather or Prismatic Scales on a shared daily CD.
It definitely appears that Blacksmithing is receiving a lot of love in this patch. I know I plan to have mine leveled up and ready to go before it hits. The contents of the JC Serpent's Heart will be interesting to find out as well.