The Final Fantasy Advent Children: Complete Blu-ray discs have arrived in Japanese retail stores and you can see one retailer holding the box in is hand here.
A demo of Final Fantasy XIII is included in the pack, so watch for movies very soon.
Still no word on when to expect the game to hit the western market.
More through the link.
Update 2: It looks as though this isn’t the movie’s packaging, rather a placement case for pre-order. Thanks, gehasoku.