Disney has released the operating schedule for October 2011 at http://www.disneytravelagents.com/StaticFiles/DTA-Domestic/pdf/ParkHours/WDW_Operating_Calendar_oct.pdf. You may need to click that link and click the refresh button on your browser to load 2011 if you previously visited that link and it showed the 2010 dates.
For more information on how Disney puts together its operating schedule and more information about the difference between the Travel Agents site and DisneyWorld.com, please see: https://www.easywdw.com/uncategorized/figuring-out-disney-world-theme-park-hours/
Is it safe to assume the nights that MK closes at 7 will be for MNSSHP?
Yes: http://www.easywdw.com/news/mickeys-not-so-scary-halloween-party-mnsshp-2011-dates/