Sony's BD player BDPS790 upscales to 4k, so maybe they will just carry over that feature to the PS4. It's too bad if the video from games can't also be upscaled.

Greg
VP180, M80s, M22s, QS8(4), CSW S305s, EP500, Pioneer VSX-90
M2i, M3(2), Pio vsx-1020