Originally Posted by
Paul
It's two seperate things, the mixology and the alchemist's stone. The mixology is an alchemist only bonus, kind of like blacksmiths adding two sockets only they can have, or tailors embroidering their cloak, or leatherworkers placing fur lining on their bracers. Mixology is on par with these other professions' unique bonuses.
The alchemists stone is a crafted item, kind of like a blacksmith making the crafted boots from ICC. Anyone can equip a trinket, so it wouldn't give alchemists any profession-specific advantage to have one they could craft unless the alchemist stone were better than any trinket drop out there.
I think they've just been focusing on other things, and there's still a chance they'll add a new stone in before cata.