From our thread on the Unity Forums

Finished the major functionality of the quest editing system, it can add and remove quests and quest chains, rename them, assign starter and turn-in NPCs, add/remove/configure objectives and NPC set dialogue text. References to linked quests are automatically updated when quests are renamed or deleted.

The entire quest structure is saved as a binary asset which is loaded at run time by the QuestManager.

Still to be added are functions for filtering and searching quests by name, zone, starter/turn-in NPC, objective type etc. etc. This will become increasingly necessary as the number of quests in the game increases.