Scheduled release now works at section level too, not just modules and lessons — you can unfold a programme in parts inside a single lesson.
It is now clear where a setting comes from. Every module, lesson and section states whether its delay is set here or inherited from the course. If a node was overridden, it can be returned to inheritance in one action.
Copying from the course and inheriting are no longer the same thing. The old "Copy from course" button effectively switched on inheritance; inheritance is now shown in its own right, while copying really does create an independent set of settings you can edit without touching the course.
Dripping now keeps a change history: you can see what changed and when, and restore the state as of a given moment — handy when a stream schedule was edited by several people.
The "materials unlocked" email now names what actually opened — a module, a lesson or a section — depending on where the delay was set.