WIP: Documentation for Publishing Changes

OK, so many questions!
I would move the notion that the dates can either be the same or different up from lines 32-33, and make a statement about which release date takes precedence if they are different. 
"You schedule release dates for sections and subsections. By default, a subsection inherits the release date of the section it is in, though you can change it to another date."
Are they really not visible until after the release date? not on the release date? maybe:
"Published units are not visible to students until the scheduled release date. When the section and subsection have different release dates, published units are not visible until the later(?) of the two dates."