What do you want out of a "PS4K"?

[etking]

Higher framerates, more details, better textures, better lighting, better effects, PC quality graphics in general. AMDs latest APU generation can bring 4K processing at relatively low cost, so a PS4K is very realistic.

http://www.eteknix.com/amd-raven-ridge-apus-will-combine-zen-polaris-hbm/