Sony's approach to 3D involves alternately displaying images for the left eye and right eye at a high frame rate. When viewed through the included active shutter glasses, the on-screen image is precisely synchronized and delivered with the full HD image intact, for an optimum 3D viewing experience.
The way these images are separated is not part of the Blu-ray disc specification as it does not matter how the output device displays those images. For now it is most likely that either Polarised or Shutter glasses are used to present individual images to each eye.