Moodle is now back and has been updated. You will find that the first time you use any part of the new Moodle a user tour, introducing you to the new features, will automatically pop up. Note that you can re-run the tour at any time, by scrolling to the bottom of the page where there is a link 'Reset user tour on this page'.
Please note that the Queen's Guide to Using Moodle for students might not be updated for a while. For obvious reasons I am giving priority to helping staff to set up modules and the user tour provides most of the help that I think students will need. If you have a problem, as ever, please email firstname.lastname@example.org.