It just appear in amazon.co.jp that Tales of Xillia will have the original soundtrack released on September, 7th 2011.
http://www.amazon.co.jp/dp/B005E77YGM/
(First Press Limited Edition)
AVCD-38351~4
5880 Yen
4 CDs, which is on regular, in 3 CDs
http://www.amazon.co.jp/dp/B005E78GQO/
(Regular Edition)
AVCD-38355~7
4200 yen
3 CDs
I wonder, what's the extra CD on the limited edition... Since the price difference is 1680 yen itself >__< Artbook of Xillia + progress instrumental, etc. maybe? LOL xD
EDITED : This Soundtrack does not come with another version for progress, YEAH!!