Now assignments, discussions, pages and quizzes must be published before students can see them.
This feature is very useful for releasing assignments to students when you want to. If you import assignments from another course you can leave assignments unpublished until you adjust due dates.
… the item is now published
Mouse over a published item and you get the option to unpublish – Click again to do this
Some functionality only works for items which are published –
You can’t set an unpublished page as the Home page for instance.
With Modules you’ll need to click Publish on the Module header and on individual items