Gamestop Italy has details listed for the Final Fantasy XIII collectors edition. According to the listing, both PlayStation 3 and Xbox 360 owners will be able to purchase the collectors edition for €79.98.
The set has your standard collector edition swag including an art book, sound track (probably a sampler), comic book, and art cards. The listing also includes a “prequel novel” which I would assume would be a translation of Episode Zero.
Square-Enix Europe has yet to officially announce the contents, but these seem pretty spot on.