I searched out information on it and found this:
Death Cab For Cutie will contribute a brand new song to the soundtrack to the upcoming film Twilight: New Moon. The track will arrive in August, while the soundtrack itself will be out later this year. Twilight: New Moon will land in theaters on November 20.
The source is a radio industry trade paper, in the same way that Variety and The Hollywood Reporter are film trade papers.
Didn't see anything about this in the tags. If irrelevant, just delete.