Did you even read this you guys? :
This is running on a PC that has the power of next-gen consoles. An Xbox 360 controller is plugged in.
Its on a PC except its on a PC that is strong as a console, I said that because its using a Xbox 360 controller it may be a PC strong as Xbox 720 or maybe he is playing on a PC that is strong as PlayStation 4.
You underestimate Xbox 720 and PlayStation 4...
HSA/hUMA... Rings a bell?
PS4/X720 has less bottlenecks than a PC plus Sony allows developers to get to the metal, that means below API level and since its architecture is x86-64 then developers can use full potential of it since they already know the x86-64 architecture...
Also I doubt PS4 will have Jaguar cores since they can switch to Jaguar+ cores that will be available. I doubt they need some serious rehash to replace Jaguar to Jaguar+ cores.
Don't underestimate consoles too much, look at God Of War:Ascesion and how it looks and how much it fit to 512mb of painfully slow RAM and how imagine what Santa Monica studio can do on an 7Gb GDDR5 memory available.
Don't act PC Master Race, remember original Xbox? All semi custom PC hardware and years ahead. Yes it had a PC hardware but it was semi custom.