It’s true that a commercial release of the score hasn’t been released yet (don’t know if it will be in the future) but there exists a promotional release.
You can check in the Christopher Young’s discography:
Discography | Christopher Young (http://officialchristopheryoung.com/discography/)
I saw this score on ebay some weeks ago, sold at a crazy price.
Since I am very interested in this score too, searching informations, I found a website in which you can get a copy:
ROSEBUD Tienda de Cine (http://www.rosebudbandasonora.com/catalog/product_info.php?manufacturers_id=166&products_id=13895&osCsid=7dtmjs4u14lp74qt0onbkm2fh4)
To be honest, I don’t know anything about this site (I mean I don’t know if it’s seriuos and reliable) so I am not willing to pay 50€… if you are, let me know!
Thanks for the info–it was really great of you to help out! Have a good day