Just a heads up for anyone levelling a profession on an alt. In the current PTR build, the recipes for 500+ are available from vendors within the cities. Currently, you have to level to 84 then do some Twilight Highland quests before you have access.
It was noted on the front page as:
Personally, I welcome the change. A couple of my alts only really do various professions and not having to level them will save quite a bit of time.Originally Posted by Blizzard Entertainment