The development team of Tohoku University and Sony has completed work on a new laser technology offering 20 times the capacity of current Blu-Ray discs.  The most difficult aspect, if I can make sense of the google translation as well as I think I can, was reducing the size of the equipment needed to produce such a strong beam of light down to the size of commercial products.

Currently the technology can only be used in experimental prototypes costing over $100,000 to produce.  Sony plans to have the laser available to consumers within a few years.  Can anyone guess what tech will ship with the PlayStation 4?