Square Enix has opened an official site for the Final Fantasy XIII-2 Original Soundtrack. Access the site here. As usual for a Square Enix music site, you'll find some music samples.
The four disc XIII-2 soundtrack will be released on December 14, one day before XIII-2's release. You'll be able to select from a standard version, priced ¥3,990 and a first print run limited version priced ¥4,800. The limited version includes a bonus DVD.