Disney has finally announced what's heading back into the vault on April 30, 2012:
Beauty and the Beast
Beauty and the Beast The Enchanted Christmas
Beauty and the Beast Belle's Magical World
Since Disney is rolling out their Disney Studio All Access program (and movie rentals gradually switching over to streaming), this might be the last time we see these movies on any physical media format. A good indicator is the Lion King bare-bones DVD that just came out recently.
Coming out of the vault next year are Lady and the Tramp Diamond Edition (spring) and Cinderalla Diamond Edition (fall), along with Pocahontas and a few other titles that have not been confirmed yet. Following Disney's release pattern, I'm expecting Cinderella's sequels to come out in 2013, before she goes back in the vault in 2014.