The track is for the 25th James Bond film. It came with music video in last week(October 2).
You can watch Eilish performance below.
Also, Billie Eilish announced a new documentery called Billie Eilish: The World’s a Little Blurry. It revolving around the life and music of musician Billie Eilish. The film is scheduled to be released in February 2021 by Apple TV+ and select theatres.