MIT Sloan published the application deadlines for its program starting September 2015:
Round 1 – 9/23/2014
Round 2 – 1/8/2015

Sloan updated that its new essay questions will  be published by the end of June, and the application will be opened by the beginning of August.

Put Me in Business (applying in less than a year)
Put Me in Business (applying in more than a year)