Engadget reports that the Blu-ray 3D specifications has been finalized and it will be backwards compatible. The key details? First, that the Blu-ray Disc Association has chosen the Multiview Video Coding (MVC) codec to store 3D, so that even though it is now providing a full 1080p frame for each eye, it will only require about 50% more storage space compared to the 2D version, and all discs will be fully backwards compatible, in 2D, on existing players.