Last Fall Stanford took the initiative to organize live online classes. I took "Introduction of DB" and got a certificate from the professor. Some students complained that Stanford name was not on the certificate. Stanford apparently did not agree to distribute free certificates to online students. When you have a few CS students paying a high price to receive education, it's hard to give an official document for free. coursera.com was created by Stanford teachers who thought they would be better in a startup mode.
What makes MIT initiative unique is that its certificates will be MIT branded ("MITx"). This is a winning strategy, as more people will turn to those classes. Some may continue by applying to MIT itself. It will also help MIT brand reach. Note those certificates will only be free for this pilot course.
You can argue that having a certificate is something that matters or not vs actually learn something. I think a lot of people around the world will feel very proud to receive an official document that proved they know those skills.