Official English Code of Princess website. (Not as slick as the Japanese site)
For whatever reason Atlus decided to exclude some of these wallpapers in their English website so here a link to the Japanese gallery.
Agatsuma included an art-book and CD with pre-orders of Code of Princess in Japan and Atlus is doing the same for North America. The CD, however, only has select tracks from the game, it’s not a full blown soundtrack. Agatsuma, in collaboration with Dog Ear Records, is now releasing a complete 2-disc, 34 song soundtrack for the game. It’s produced by ACE who worked on the Xenoblade soundtrack (Fantastic game and music). It’s unlikely this will ever be released outside of Japan but you can always import/download. Here is the info-graphic,