the following was tested for level 60 switching in tbc prepatch.
if you have a blacksmithing specialization, you can now unlearn them by speaking to the respective NPCs in ironforge (by the great forge) or orgrimmar (by the anvils in the valley of honor)
unlearning weaponsmithing costs 5g
unlearning armorsmithing costs 50g
if you unlearn your base specialization you can pick it back up again (or take the other specialization) by simply talking to the main npc at ironforge/orgrimmar (alliance = bengus deepforge, horde = krathok moltenfist).
weaponsmith specializations can be learned (without doing the classic quests) by speaking to the respective npcs in everlook, winterspring (seril scourgebane = weaponsmith, lilith the lithe = hammersmith, kilram = axesmith).
you can unlearn your weaponsmith specialization for 50g (this unlearns hammersmith, e.g.) by speaking to the npc again. this does not unlearn weaponsmithing
[x] check which specializations can be unlearned / learned in shattrath
the following was tested for level 60 switching in tbc prepatch.
if you have a blacksmithing specialization, you can now unlearn them by speaking to the respective NPCs in ironforge (by the great forge) or orgrimmar (by the anvils in the valley of honor)
unlearning weaponsmithing costs 5g![image](https://user-images.githubusercontent.com/19498073/112783878-4e2e2e00-901e-11eb-8b2e-d3573cfffe61.png)
unlearning armorsmithing costs 50g![image](https://user-images.githubusercontent.com/19498073/112784044-ac5b1100-901e-11eb-8b67-c475c3d1b279.png)
if you unlearn your base specialization you can pick it back up again (or take the other specialization) by simply talking to the main npc at ironforge/orgrimmar (alliance = bengus deepforge, horde = krathok moltenfist).![image](https://user-images.githubusercontent.com/19498073/112784256-27242c00-901f-11eb-9528-88e8933680a8.png)
weaponsmith specializations can be learned (without doing the classic quests) by speaking to the respective npcs in everlook, winterspring (seril scourgebane = weaponsmith, lilith the lithe = hammersmith, kilram = axesmith).![image](https://user-images.githubusercontent.com/19498073/112782060-24730800-901a-11eb-96f2-897b6cd80800.png)
you can unlearn your weaponsmith specialization for 50g (this unlearns hammersmith, e.g.) by speaking to the npc again. this does not unlearn weaponsmithing![image](https://user-images.githubusercontent.com/19498073/112782370-da3e5680-901a-11eb-8f64-bf754af8613d.png)