A post I read on another forum suggested it would be an ideal time to release a PS4k...
Yes. I think that's a very good guess. I think a full use of 4k would be out of reach, so I'll predict that they will use some sort of intelligent upscaling that gives enough improvement of the user experience to give people the motive to buy 4k TVs. Ideal would be something that would only work on Sony
VP180, M80s, M22s, QS8(4), CSW S305s, EP500, Pioneer VSX-90
M2i, M3(2), Pio vsx-1020