For loot you can depend on …
The caverns, mines, and ruins now each have 1 weapon chest (random weapon type) and 3 weapon racks (one for each weapon type).
The caverns did not change. The mines went from 2 chests and 3 racks to 1 chest and 3 racks. And the ruins went from 4 chests to 1 chest and 3 racks (plus the ruins boss racks, if unlocked).
Player feedback in the forum led to this change.