The course page is timing out for me at the moment so I can't see what it says, but I emailed coursera last week asking about the start date. Their reply was that it was now expected to start in mid-April.

I've been looking forward to this course for a while. It was supposed to start in March, I hope it doesn't get pushed back again.

Because the classes are designed for people who want to take various tests, keep score, track progress and participate in discussion. I think downloadable video files are floating somewhere, not sure about lecture notes, etc.