All the material's still online, if you want you can just go ahead and start on it. I started yesterday. http://www.ml-class.org/

It's on hold. I got the email an hour ago:

  Thank you for your interest in Machine Learning. A launch date for this course
  is currently on hold. I am excited to offer our material online for free. We
  apologize for the delay and will be sure to let you know when we confirm a date
  for this course to go live. In the meanwhile, you might check out the five free
  online Stanford courses that will go-live on March 12 and March 19 at www.coursera.org.

  Thank you for your interest.

  Andrew Ng
  Machine Learning

No need to lose hope. There already was an (excellent) machine learning class last semester, so they should have the material ready.