This certainly has the Disney sheen all over it and will probably be a film to enjoy, but I am not sure how close to the truth it will go as P.L. Travers hated the Mary Poppins film and never worked with Disney again.
The film centers on the life of Travers, shifting between 1907 with her childhood in Queensland, Australia, the negotiations with Walt Disney and the making of Mary Poppins in the 1960s. While in California for filming, Travers thinks back to her difficult childhood in Australia, most especially to her father, the inspiration for the role of the story’s patriarch, Mr. Banks.
The film stars Emma Thompson, Tom Hanks, Paul Giamatti, Bradley Whitford, Ruth Wilson, Rachel Griffiths, Colin Farrell, Jason Schwartzman, and B.J. Novak.