The quest is not completely gone. I'm not sure how it works on Alliance side, but on Horde side I had to talk to an individual first and choose which specialty I wanted, then he had me go to the guy who gave me the quest. Check out
"The Way of the Weaponsmith", that's the quest you'll have to do as Alliance. I'm just not sure who you have to talk to in order for the quest to be available from that NPC.
EDIT: Aha, there is a post in that quest's thread that explains it. In IF you have to go talk to the Artisan Blacksmith, tell him you want to become a Weaponsmith, and he'll point you toward Ironus Coldsteel (who is apparently right next to him) for the quest.
Edited, Jun 18th 2008 8:48pm by TheRogueX