Everything will be heavily tied to your garrison
in the new Warlords of Draenor expansion, and professions are no exception, you can't craft anything without your garrison.
Below you will find explanation for the most important changes to the crafting system.
Profession skill level requirements removed
You can craft most new recipe from skill one. (skill requirements for old recipes remain unchanged) This is probably the biggest change, because you no longer have to spend thousands of gold to level your profession skill up. Your skill level now determines how many resource you get from doing your daily profession cooldown. There are some recipes for inscription and engineering that still requires 600 skill.
Work orders and daily cooldowns
Work orders and profession daily cooldowns convert raw materials like herbs and ores to a more useful reagent. Almost every new high level item you can craft requires this reagent generated from doing work orders, or your profession daily cooldwon, these reagents binds on pickup
(except enchanting and alchemy).