Something is wrong with your Horizon res. 2160p is 4K, which is 3840x2160 for TVs. You sure it's not also running 1800pCR?
Anyway, for the PS4 I'm expecting a Ryzen 1700 and a Vega 10, which is a 12.5 Tflops GPU, with 8GB of HBM2 for games and 1-2 GB DRR4 for the OS. I'm sure both chips will be slightly downclocked to help with heat, so we're probably looking at a ~11-12 Tflops machine. I think that should definitely be enough for a decent graphical boost from this gen, but in 4K. I still think devs will use 1800p2160pCR if they want to push visuals even more.
Edit: Or am I misinterpreting you? Are you saying that Horizon uses checkerboarding to get to 2160p and ME:A uses it to achieve 1800P? Cause if so, that is pathetic for ME:A.
