Many thanks to Ayako for tweeting the link and to NeoSoundtrack5 for the soundtrack clips.
NeoSoundtrack5 has posted two clips from the 47 Ronin soundtrack on youtube. The clips are just the soundtrack with no accompanying footage. They are here and here.
http://www.youtube.com/watch?v=bjYwzZS3Jtg
http://www.youtube.com/watch?v=jHg4iTJzGbU