I called Disney to find out if these dates were even close and the CM actually laughed a little and said that "No, the dates you have seen are NOT from us. They may be correct or not but the people that make the decision on those dates haven't even made the final decision yet.". She said that the dates seen on ANY other site OTHER than Disney should be taken as "hopeful dates" and not set in stone.
So please folks, don't make the mistake we made on our first trip to WDW during the MNSSHP. Don't plan your trip start dates according to dates provided by sites other than Disney.com.
There is another site out there that is posting "Actual" dates for the MNSSHP and MVMCP each year about 4 months before Disney even decides to think about coming up with them. Thankfully
this year they have added a disclaimer that says "Unofficial Dates" at the top of the dates posted.
I dont want to sound like a (blank) here but Disney sites should take a little bit of responsibility and stop trying to "one up" each other. Some people see these "set dates" from some sites, then plan out their PSings, then after they have done so they find out that the dates they got were wrong. Then when they try to change the PSings they are told that there is nothing available for the day and time they want. All because of dates getting posted before being confirmed by Disney.
This thread started out saying "Provisional dates for ..." and has become people saying that the dates are confirmed.