Lin-Manuel Miranda developing secret Disney film

Actor/composer Lin-Manuel Miranda is bulking up his resume with moviemakers at Disney by working on a secret film.

The Hamilton creator has been cast as a lamplighter named Jack in Mary Poppins Returns, starring opposite Emily Blunt as the titular magical nanny, and he also composed tracks for Disney's new animated film Moana - and now the 36-year-old is teaming up with Zootopia co-director Byron Howard on a new movie.

"That's the fun thing about working with someone and having it go well - you go, 'OK, what else can we do?'" he tells Vulture. "(Disney CEO John) Lasseter took me aside and said, 'I have an idea, here's Byron, and you guys should start talking'."

Miranda would not disclose any details about the top secret project, but he did reveal it could possibly take years for the film to come together.

"We literally haven't gotten in the room yet, but we're plotting," he adds.

In addition to the multiple films the actor has in the pipeline, he is also teaming up with Alan Menken, who scored the original 1989 The Little Mermaid, to create songs for a new live-action movie. Lin-Manuel will also produce the film and supervise the storyline alongside Marc Platt.

In December (15), Miranda revealed he has long admired the animated film, telling Entertainment Weekly, "It's the movie that's probably most responsible for me being here.

"I started taping the Oscars because I wanted to see Geoffrey Holder's performance of Under the Sea. That was the beginning of the end. Or, the beginning of the beginning, depending on how you look at it... I could sing you not only the songs in Little Mermaid but the music to the score. That's how important those scores are in my life and in my upbringing."