World Of Warcraft: Blacksmiths

Hi, I'm a blacksmith myself and I read on blizzards BC page that we can make a new choice about being an armorsmith or weaponsmith.
Any idea what this is going to be like? Completely start from scratch with BS? Doing the weaponsmith questline instead of armorsmith? Its not very clear at the moment..

You'll be able to drop your currect specialization and take another one, but you won't be loosing any BS skill at all. You'll have to complete the other specializations questline though.