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