Square Enix confirmed tonight at a Japanese press event that Final Fantasy XIII will indeed be out on December 17. Least, that's when it'll be out in Japan.
The date isn't a surprise - not after it was accidentally leaked by Square on the company's YouTube site - but still, it's nice to get confirmation.
It's priced at ¥8800 (¥9240 with tax), which works out to be USD$95 (USD$100). So, yeah, expensive.