Consoles don't do Ultra settings.
A 980Ti can do Doom 4K 60 FPS and MANY other titles including Forza Apex in High/Ultra mix settings.
No reason to believe the upcoming Forza and Halo cant run in 4K, developed in an optimized environment with no driver overhead as dealt with on PC.
That said, not all games obviously can run 60 fps at 4k and they will have to baseline at 30. There is also less of a need for expensive AA at 4K which frees up performance.
In any event, 6TFlops is nothing to sneeze at and lots can be achieved with that amount of compute in an optimized environment.
Also the rumors are from E3 that AMD has said it has MORE than 6TFLOPS and the CPU is all new. Could be Zen cores, could have overclocking headroom. Combine that with 12GB of GDDR5 and likely a 384bit bus delivering 320Gb/s in system bandwith...it sounds impressive for a console product.
You wont see Alienware selling an Alpha like that.
PC I i7 3770K @4.5Ghz I 16GB 2400Mhz I GTX 980Ti FTW
Consoles I PS4 Pro I Xbox One S 2TB I Wii U I Xbox 360 S