The game goes out on the 31st January and these files will come in 7.7 GB for the Xbox 360and 14.446 GB for the Playstation 3, which is about half of the original Final Fantasy XIII file size. To make it more interesting the developers say that there will be a special collector’s edition available with four disc original soundtrack.
According to the tri-Ace Lead Developer Yuichiro Kitao, who posted a tweet on Twitter;
Our staff is in the credits, as Final Fantasy XIII-2 has requested the help of tri-Ace. We had the privileged to contribute game design and art. (Translation, the original was in Japanese)
Source [In Entertainment]