This press release from Lionsgate, featured on The Wall Street Journal (among other sites) goes into deeper detail about the upcoming Catching Fire Soundtrack:

NEW YORK and SANTA MONICA, Calif., Sept. 26, 2013 /PRNewswire/ -- Lionsgate (NYSE: LGF) and Republic Records today announced a powerful, star-studded lineup for the soundtrack to the motion picture The Hunger Games: Catching Fire, mixing established music icons including seven-time Grammy(R) winning band Coldplay, Rock and Roll Hall of Famer Patti Smith, and Grammy Award winning Christina Aguilera, along with some of the hottest Billboard chart topping newcomers in the music business.

Also top-lining this exceptionally talent-rich collection are The Lumineers, whose self-titled debut album achieved platinum sales status in the US, Canada (3x), UK, Ireland and Australia and Gold in Germany and France, with their hit single "Ho Hey" selling over 4.5 million single downloads in the US. Lorde, whose debut single "Royals" just made her the first female artist to top the Billboard Alternative Songs chart since Tracy Bonham in 1996, will also be featured on the soundtrack.