Last year for DMC, SoundtrackNet put out a preview, allowing visitors to listen to clips of the soundtrack for the movie. This year, SoundtrackNet has done it once again, allowing us a preview of the soundtrack for the movie, which can be heard here: http://www.filmmusic.com/features/article/?id=231
Keep in mind that these are only limited samples, however, last year, AOL Music had a full soundtrack preview prior to the release of the movie, and I wouldn't be surprised if it happens again this year.
Now, about the soundtrack itself, I'm really excited. I loved the soundtrack to CotBP, and I loved the soundtrack to DMC even more, even with the composer switch. This soundtrack, on the other hand, based on the previews alone, is going to blast both out of the water.
And as an added bonus, I offer this 14 minute Making-Of clip from Starz....enjoy (probably spoilers, so....don't watch if you don't want to know)