My very first thread, let's hope it's a decent one, for the sake of this reputation mechanic here... :P
Essentially, once again, Blizzard has missed something. Something they've missed before, even!
The furbolg trainer in the Timbermaw Cave just trained me up to Grand Master Tailor in live, a day after the patch. I was just grinding some rep, hit revered and went to talk to the ones inside to see if any quests or whatnot opened up... and bam, 12 gold later I have 50 achievement points and am at 375/450 tailoring.
I consider this an exploit, as no other profession trainers I can track down will do this yet, so it seems an unintended oversight by Blizzard. Enjoy!
EDIT: Thanks to poster Etherea, below, we now know that you must be at least FRIENDLY with Timbermaw to be trained. Cheers!