Its a dastardly scheme to trick those who don't research first to double-dip. They are hoping to get people to buy both the "theatrical" AND the extended versions. They did it with the DVD versions, and they are doing again here.
Please, don't buy these, and more importantly, tell your friends NOT to buy them for you for Christmas! ("Oh, he loved those movies, and I know he doesn't own them on Blu-Ray yet... ")