Janet, 

Here is a link to one of the courses: 

https://www.ai-class.com/

 If you click the "Visitor" link (enrollment is closed at this point) you can browse through the course and look at the time table, assignments, materials, etc.  I've looked through the first section of the course (watched all the videos, taken a quiz or two and participated in some discussions) and it is very very impressive.  All that said, I have no idea how they are grading all the papers, quizzes, and discussion postings.  My guess is an army of grad students, but I honestly don't know.