There are no other announcements regarding the 2015 Mickey's Not-So-Scary Halloween, nor are tickets released - but the dates have been released in the 2015 Flower and Garden Festival map at Epcot...
September: 15, 18, 20, 22, 25, 27. October: 1, 2, 4, 6, 8, 9, 12, 13, 15, 16, 18, 20, 22, 23, 25, 27, 29, 31. November: 1.