LucasArts' Bounty Hunter site
has a few tracks on it, I know that much. Don't know the quality yet, though.
Also, are you still considering a Grim Fandango Complete Soundtrack, or at least a follow-up that contains some of the decent tracks not featured on the official CD? Lupe, Start Credits, Glottis' Theme, Carla's Life Story amongst others would make a pretty decent list.