To be clear, they say it scales down to keep 60 fps. That's what the tech is for. The only difference is they don't cap it and allow it to render higher res and downsample. This will certainly keep workload more constant and may help with timing and stuff. The mentioning of 6k is just a bit daft, as people will likely run with it while the game isn't rendering (the proper, full game) anything like. Average res is, I'm guessing, slightly below 4k because that's why they use dynamic scaling for the times it drops. There'll just be some freak cases where you can it at super duper high res when it's got time to fill and nothing to draw with the current scene.