Core38, PRODUCTION TRACKING AND HISTORY TRIGGERS, (Future): The objects at a site need to be tracked in an abstract form so that the world can use them without loading up the site files. Any changes could be applied to the site file retroactively when it is loaded (the same is true of damage from wars and so on). Stores should restock their inventories. The objects need to be separated based on the entity that owns them, since several entities can potentially operate at one site. Past production can also be stored (especially from your own dwarf fortresses and these facts can be referenced in the legends and art work. However, your own fortress facts could be hidden, forcing you to find the information with adventurers. When you enter a fortress, each hidden historical event and fact could be associated to one or more triggers, such as the produced objects, diaries, etc. It can also track facts about artisans in a similar fashion. Other facts like the number of executions, population break-down, amount of mining and so on could all be referenced.
also:
Core21, SOUND, (Future): Make all music/sounds optional, in groups. More songs (possibly seasonal), incidental music (like spotting the first kobold in a cave, etc.), various combat type sounds and ambient sounds, pleasing interface clicks.