greenmedic88 on 30 March 2011
Most likely a proprietary format readable by a standard DVD laser. New security measures to reduce piracy and possibly reduced footprint for the current on disc security measures in use.
Since the wavelength of the current laser used in DVD drives can't be reduced, the lands and pits on the disks themselves can't be reduced in size to allow for more track space on the media. Same goes for the capability to shift focus to read more than 2 layers of data encoded on a single layer.
Unless MS engineers have found a way around what is essentially a physical limitation of the hardware standards used in the current DVD drives, security is likely to be the main reason for this update.
