no it hasn't been discussed at all, good thread can't wait to see people's opinion
Opinion B:
Won't know until MoP hits.
And someone correct me if I am wrong, when MoP goes live: there will be a new set of "rare engineering recipe" from leveling it up to max. Because of this, they are giving everyone the recipes from the trainer for tazik, synapse,armor, mana/health potion, etc that were @450.