Music4Games has information on the upcoming soundtrack and single releases for the Nintendo DS remake of Final Fantasy IV.
The two-disc set, featuring arrangements of Nobuo Uematsu's amazing original Super Nintendo score by Junya Nakano and Kenichiro Fukui, will go on sale in Japan on January 30th, 2008. This set will also include a promotional DVD.
For now, there's the CD single for the game's love theme, "Tsukino Akari - Final Fantasy IV Theme of Love," peformed by Megumi Ida. Like the full album, this single will include a promotional DVD containing two promotional videos (Japan's name for music videos) and the Tokyo Game Show trailer.
If you're thinking about importing, I recommend CD Japan as they don't hike up prices. Keep in mind that the promo DVD will only play in Region 2 players, but if you're geeky enough to import (like me), then this isn't a problem for you.