Sony will definitely wait til the PS5 to come out with this tech. The PS4 will most likely just have a 4x-6x Blu-ray drive to help keep costs down. I would imagine the PS4 to be ~ $400. Plus, Blu-ray is still working its way up to being the norm. A new tech so soon would most likely just hurt sales of the new tech, which would make the PS4 (if it contained the new disc tech) an oddity.