Highlights:
CPU
AMD Jaguar 1.6GHz 8 Core - PS4
AMD Jaguar 2.1GHz 8 Core - PS4k
RAM
24% increase in bandwidth
512MB more is now usable...?
GPU
14% boost in clock speed
18 compute units to 36 compute units in PS4K
2.3X increase in Teraflops
Potentially an AMD GPU Polaris 10 or Tonga R9 380 architecture, not quite clear
Should be interesting to see where this goes.