According to Big Picture Big Sound:
Fantasia four-disc boxed set will contain a beautifully restored version of the 1940 classic–scanned at 4K and remixed for 7.1 channels–as well as Fantasia 2000, plus a platter of Blu-ray extras and a DVD copy of the film. Among the many special features will be an interactive edition of the fabled Shultheis Notebook, (LP note the original special effects notebook of Herman Shultheis that is part of the Walt Disney Family Library collection) and the first-ever home video release of Destino, Walt Disney’s collaboration with Salvador Dali. Destino is backed by its own 70-minute documentary. They also report that several standard definition bonus features will be made available through BDLive.