Working on a (freaking huge) diagram, nearly done after two days of off-and-on work. Missing a few ??? locations, and some drops from:
Lividroot Amooshah (2)
Reacton (1)
Anataboga (1)
Dea(1?)
Gotoh Za the Remolant (2)
Achamoth (2)
Khromasoul Burborlor (2)
Nosferatu(1?)
Nuhn (2)
Experiemental Lamia (1)
Mahjlaef the Paintorn (1)
I'm not sure if the elemental grips count as part of Dea and Nosferatu's drops. Elemental grips seem to have dropped from 4 of the tier 3 NMs so far, and they vary even per-NM so I'm hesitant to call them the second drop, since Armored Gears was reported to drop Oracle's hands, Tomoe, and several different grips.
After I have at least the drops above and the ???s I'm missing filled out, I'll post a nearly-complete version of the diagram here. Just personal guesses based off what I think:
The 9 tier 3 NMs will drop 3/5 of the oracle's, enkidu's, and aurum sets (1 piece of each per NM), probably distributed one piece of each set per "area" (i.e. I think Nuhn will drop one of the Aurum pieces to make one of each of the set in the lamia "area" set of NMs). I also think that each tier 3 NM will drop a weapon, since there is a huge amount of weapons unaccounted for yet, compared to the small amount of armor remaining. Finally, they may each have a chance to drop some of the elemental grips.
The 3 tier 4 NMs will more than likely have two pieces of the remaining 6 from the above three sets. More than likely, one will be the body, and the other possibly the head piece. Knowing SE, they probably are not of the same set on the same mob. In addition, I'm going to predict that they will each also have at least one weapon, perhaps two, each. Finally, I'm going to think that each one will have one of the Magic, Brave, or Wise grips, no idea one which one for which mob yet.
The final mob (Pandemonium Warden?) will probably be given the Hachiryu Armor set. I say this based on the differences from this set compared to the other three (non-Ex, no head piece, new DAT design, etc). I will venture a guess that he will drop at least a guaranteed 2 pieces every time (because if you have to kill 30 NMs to get one pop of him, it better be at least that much) with hopefully a shot at more per kill. I also think he will be the source of the two staves everyone is drooling over, Dorje and Alkaurops, based on their comparative strength to the other weapons, and the fact that again, they are only Rare, and not Ex. For the same reason, I'm going to also hazard a guess at Organics possibly being in his drop pool, but that's purely personal speculation, no basis. (I hope it isn't, I want one

)
I'm making these guesses based off being able to probably guess where the rest of the items in the update fall, like the Reikyo Hairpin is more than likely going to be a drop from Amooshah due to the bad breath on it. In addition (correct me if I'm wrong) but all of the drops so far off ZNMs have been Rare/Ex, no Rare ones. Most of the Rare only items added this update have either been confirmed off other NMs (Serket, KA, etc) and the others may be obtained in a similar way. I'll compile an easy to read Rare vs. Rare/Ex list of the non-found items so far, if anyone's interested in following my trains of thought.