Disney has set the sequel for December 2018
Call it a spoonful of sugar for the holiday season.
Miranda will play a new character, a street lamplighter named Jack.
Both had been reported to be in talks for those roles earlier this year.

Credit: Jason Merritt/Getty Images; Dimitrios Kambouris/Getty Images
The film will be directed by Rob Marshall and produced Marshall, John DeLuca, and Marc Platt.
It will feature a screenplay by David Magee based onThe Mary Poppins Storiesby P.L.
She and her friend Jack then help the family rediscover the joy and wonder missing in their lives.
I am truly humbled and honored to be asked by Disney to bring P.L.
Travers further adventures to the screen.
She also penned seven additional books starring the no-nonsense British nanny.
Blunt previously worked with Marshall on the big-screen adaptation of the musicalInto the Woods.