We’ve known for a while that Mary Poppins was making a return to the big screen in the upcoming Disney film Mary Poppins Returns. We’ve even gotten some casting news here and there, but, for the first time, we now know what the movie will actually be about.

Mary Poppins Returns will feature an all-star cast, including Emily Blunt as the magical nanny herself and Lin-Manuel Miranda as Jack the street lamplighter.

The cast also features such big names as Meryl Streep, Ben Whishaw, Colin Firth, Emily Mortimer and Julie Walters — and, of course, Dick Van Dyke, whose appearance in the new film we’ve already discussed on this very website. He’ll be playing Mr. Dawes Jr., son of Mr. Dawes from the first film and chairman of the Fidelity Fiduciary Bank. This is certainly fitting, as he played Dawes in the original film, as well.

Set during Depression-era London, Mary Poppins Returns will follow the children from the original film, who are, of course, now all grown up with children of their own. But life is thrown into turmoil when Michael suffers a great loss and Mary Poppins returns, as per the move title, and uses her magical abilities to help the family heal.

New characters will be introduced as well, including Mary’s unusual cousin Topsy, played by Meryl Streep, and Lin-Manuel Miranda’s Jack.

Production has officially begun on the film, which is scheduled to hit theatres December 25, 2018.

Will you be celebrating the holiday season next year with Mary Poppins Returns? Let us know in the comments below!