According to IMDb Dario Marianelli is working on the new adaptation of The Secret Garden, directed by Marc Munden, and produced by Rosie Alison and David Hayman, producers of Paddington.
Recently, Roshan Gunga, a composer that Marianelli mentors, published this photo on Instagram with Marianelli conducting:
https://www.instagram.com/p/Bz6FeFdhNWV/?utm_source=ig_web_copy_link