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1. Codex: Cults. Combined list allowing the creation of Chaos, Genestealer, hell even Tau Gue'vesa, Redemptionist or Mutant cults. Obviously non-overlap between the various types, but some things would be common to each.
2. Codex: Inquisition. Demon/Witch hunters don't get enough love. Perhaps by amalgamating them all into one codex, you will see a little more love. Perhaps you have to choose an Ordo for each army, and restrictions placed as thus.
3. Codex: Adeptus Mechanicus. Long overdue. Even a list in an Imperial Armour book would be nice.
4. Codex: Demiurg. Lets bring back the Steam Punk dammit.
5. Codex: Tau Decline. Lets see the Tau get annihilated by the Tyranids and Orks, and this is the codex when they stop being perfect Mary Sues and become something much more bitter.

If Codex: Demiurg happens I'd like to see it play more like an Ogre Kingdom list with the "Ogres" being quasi-mechanical beasts controlled by dwarf-like overlords. Maybe it could have a synapse-like mechanic to it.

Maybe Power Armor that makes the Tau realize they're using the crappy previous-generation tech the Demi-urge were trying to get rid of?

Related question: I know there was a reference in the Tau Codex to the Necromunda Spyrer suits being originally from Tau space. Was this specific that they are Tau tech, or one of their allies?