The Disney Parks Blog announced that a new Cinderella Castle stage show will be debuting this summer called, "Mickey's Royal Friendship Faire". The show will replace Dream-Along with Mickey, which will have it's last day of operation on April 2, 2016.
The new show will feature, "Mickey Mouse and his friends" alongside characters from Disney's newest classics, The Princess and the Frog, Tangled and Frozen.
Per the blog:
In “Mickey’s Royal Friendship Faire,” Mickey and his troupe of Merry Makers have been preparing to host a joyous festival and have ventured far and wide to invite friends from other lands to join their celebration. From the Land of the Bewitching Bayous, Goofy has invited Tiana, Naveen and Louis to add a little spice of New Orleans jazz to the party. From the Land of the Enchanted Woods, Donald Duck brings some new friends he met at the Snuggly Duckling, and Daisy introduces us to her special guests, Rapunzel and Flynn Rider. Finally, Mickey shares a surprise with Minnie, as he has traveled to the Land of the Mystic Mountains to invite Olaf, Anna and Elsa, who contributes a blast of her icy magic. It all culminates in a grand dance, as the Merry Makers invite all their special guests to join in the fun.
We have been tracking this rumor here.