I'd say at least a proper first or second wave for all the new 1st edition Aos armies left in shambles (Ironjawz,Fyreslayers and so on) and the legacy armies with too much finecast (like Skaven).
If we're talking about brand new armies and or ideas going by GA:
Order: Faithful of Sigmar reinforcement for Cities and\or Grungni-Valaya brand new classic-dwarves (perhaps absorbing old dispossessed).
Death: Deadwalker own army, some meat monsters and zombie nobilty like in the lore.
Chaos: Chaos duardin, is the only possible new angle still not explored in chaos forces (not counting FW models that got unfortunately canned).
Destruction: Evil Sun worshipper or something like that mixing Grotbag air Grots and Gitmob wolf-riding grots, the first updating the old "contraptions" of goblins in whfb.