Yeah i've noticed a lot of console apu's are made by amd. Though if we look at the trends of things, that said i'm still skeptical about 8 gigs of gddr5. I mean sure they can try to make games look prettier to an extent, even with software tweaks i don't think i'll see any leaps or bounds in console games until the next console. I'm pretty sure their at their limits.
Have you been following the nvidia/async/aots thing? It appears there is more left in the consoles, not anything revolutionary but from what some devs have said around 30%.
That only pertains to dx 12 and i don't think ps4 has that capibility. Even then the articles i've seen state specific iterations of gpu's. Unless consoles had that kind of cutting edge tech that even now is barely released in newer models. I doubt we'll see 30%.
PS4 is not DX12 capable. They use a custom Linux kernel for the OS and a custom OpenGL API for the graphics layer. At best they might be able to upgrade it to Vulkan but that is if the AMD APU supports Vulkan which I do not think that it does.