Bungie has produced an entirely new soundtrack for the upcoming expansion to Destiny, The Taken King, which releases tomorrow. You can hear a snippet right here.
The soundtrack is composed by Michael Salvatori, C Paul Johnson, and Skye Lewin according to the credits on the cover (and not former Bungie composer Marty O'Donnell - so presumably anything he had a hand in has been expunged from the soundtrack), and will release alongside the expansion. It's available through either Amazon or iTunes, or in a special higher quality version through Bungie's own store.