The track will appear over the end credits for Widows, a film adaptation of a UK TV series.
The Los Angeles Times reports that the British band's newest song will play over the end credits of Widows, which is a feature-length adaptation of the UK television series of the same name. It stars Viola Davis, Michelle Rodriguez, Robert Duvall, Colin Farrell and more.
"It was an honour to work with such a legend," McQueen said. "Sade is an incomparable talent and incredible artist who so rarely releases new material, but luckily the original series of Widows had deeply resonated with her."
There's no word yet on how "The Big Unknown" will get a release outside appearing in the film. It's Sade and her band's second new song of the year after "Flower Of The Universe" on the A Wrinkle In Time soundtrack.
Watch a trailer for Widows.