In addition to the refreshed graphics, the 3DS version of Dragon Quest VII will feature an orchestral score by the Tokyo Metropolitan Symphony Orchestra. Square Enix has yet to announce any plans to release this outside of Japan, but all three of the DS remakes made it to North America. Recently, Dragon Quest games have been published in North America by Nintendo.
Update: A Square Enix representative has told Joystiq that Dragon Quest VII is currently being "evaluated" for the western market. "We're currently evaluating the title for the Western markets, but nothing has been determined. Please stay tuned for more information."