At the D23 Destination D Event, Bob Chapek (Chairman of Disney Parks, Events, Consumer Products) announced a new event called Mickey & Minnie's Surprise Celebration coming to the Magic Kingdom from January 18 - September 30, 2019.
Details were also on the Disney Parks Blog. The event will feature new food, merchandise and entertainment, including the new Move It! Shake It! MousekeDance It! Street Party with Mickey, Minnie and their friends.
Our full rumor tracker for the event and the Move It! Shake It! MousekeDance It! Street Party can be found here.