Or maybe - just maybe - it's a matter of TW3 being multiplatform? And maybe - just maybe - CDPR is trying to balance the different audiences' reactions when they see the game at work?
What I mean is - maybe they don't want to boast with some ultra-settings footage from dual-Titan PCs as it could give wrong impression to people planning to buy the game on consoles(you know, false advertising and stuff). On the other hand, they don't want to release any comparisons between PC and consoles' versions as the difference would be huge and that wouldn't be in their favour.
So they are caught between, how do you say it? The rock and a hard place? Trying to balance stuff by releasing "middle ground" screenies, which will of course not satisfy those who demand pure awesomeness in graphics department.
This possible. If you are remember the 35 min demo, that thing runned on PC at High setting which means that looked like pretty much like the console versions with better framerate. They could be run that demo on a high end PC with everything maxed otu, but they did not. I think this is te reason why didn't do that back that time.