Wow, that's a great song they've got playing in the Japanese site, it's both Final Fantasy and something fresh at the same time. But to even it out, the English site music is a really standard and unimpressive version of the Prelude.
Apparently, the Crystal Bearers soundtrack is composed by Hidenori Iwasaki, who did some tracks for Crystal Chronicles, and seems to be best known from the Front Mission series. Guess that explains the change in style, no Kumi Tanioka this time?
The spaghetti western theme in that one trailer is too goofy for my liking but that Japanese site music lifts up my hopes for the soundtrack, it's about time Kumi Tanioka was given a rest and Hidenori Iwasaki has some great stuff in Front Mission 5 especially.