Received acceptance today! Very excited!
Since these posts will be read by others in future years as they prepare to apply, here is some good information:
Registered interest in program (website): June 2014
Official classroom visit at MIT: October 30
Submitted application (Round 1): November 5
Received interview invitation (email): December 5
Interview (Skype): December 12
Admitted (email): December 22
I highly recommend the official classroom visit. I found it to be the best way to find out about the program and got to know some of the members of the admissions committee and fellows of the current class. Having visited in person allowed some of us to be interviewed earlier than usual, which is a great advantage, especially if you are applying to other programs, such as Stanford MSx which admits in December as well.
Good luck to all, and have a great Christmas!