And then you have this:Tinfoil hat on. Video pulled that showed the game with full pc-graphics, devs talking in circles, refuses to give a straight answer. Nvidia pushing their latest graphic card like there is no tomorrow, telling us that it is basically required to run the game. Then we of course have Sony and Microsoft involvement too. Fun drama this.
According to pcgameshardware.de:
Fortunately, the performance is very good, both Radeon GPUs and GeForce graphics cards provide very good frame rates. Also pleasing: For Ultra-Details and Full HD all it takes is a middle-class graphics card such as GTX 770 or R9 280X.
So the game works pretty good on older cards..
It's all Nvidia's job.