I haven't seen the movie or heard the score so I can't say anything on that. I think the reason the score was released in April is because the movie was orginally supposed to come out in May, but due to all the stuff that went down in Colorado, got pushed to July.
It's a good score to an excellent movie. The score is by Angelo Badalamenti with a few techno touches by Tomandandy. It's very suspenseful and gets more exciting by the end. No real themes but it's all very atmospheric. The techo bits are actually really good. The first track is brilliant. See the movie first.
The movie is outstanding. I thought the score during the movie was actually quite good, but I felt that the whole credit's sequence with Tomandandy was a little out of place. I haven't heard it out of CD, though, so I guess I'd need to before passing real judgement.