Section 0 contains list of chapters. Click a chapter to open (opens a new section).
See picture below for the main view.
Basically each section shows a list of chapters followed by normal section content.
You can also include quiz-questions directly in the section. These can be used to control display of content (chapter only available if you score more than ... ).
You can git the new course format from gitorious by invoking
git clone git://gitorious.org/workbook/mainline.git
install as course/format/workbook/..
You'll also need to git lgcquiz from
git clone git://gitorious.org/lgcquiz/mainline.git
install as mod/lgcquiz/..
It's rather fresh (raw) - but it might be of interest for the adventuresome.