Xbox One's dynamic resolution scaling may also help to uphold this level of performance - in effect before and after the patch. In theory, this allows the framebuffer to switch between a 1600x900 resolution to a native 1920x1080 on the fly, seemingly based on GPU load at any given point. However, in practice this doesn't switch as much as we'd expected - The Witcher 3 is predominantly a 900p game, and the only scenes we've found to run at a full 1080p are the in-engine rendered title screen, and the video cut-scenes. Even reducing the GPU load by looking directly up to the sky shows the game is still rendering at a native 900p. We do notice some indoors scenes rendering at what seems to be a higher resolution than 900p, but even here, it is clearly not a full, native 1080p output.

http://www.eurogamer.net/articles/digitalfoundry-2015-should-you-install-the-witcher-3-day-one-patch#comments

Wow that's some crazy spin right there. Should have made the scenes play at 4K an then advertise dynamic 4K if you are going to spin May as well go all out.

Just as planned, they really think people are dumb

So, it's static during gameplay and not a dynamic buffer like in Tekken Tag Tournament 2.

A somewhat troubled launch on all platforms, I'll wait a few months until I get it on PC.

I thought people stopped expecting XOne to achieve 1080p a long time ago.

But but.. it does 1080p.... in the title screen.... wtf?
Are you trolling? is this real?

Some games have achieved it though. 

wow, all that bragging about dynamic scaling...turns out to be more fud.

FUD is fear uncertainty and doubt, basically fear mongering to hurt a competitor.

This is the oppersite, its like... PR on overload, theyre makeing the Xbox one out to be something its not.

Basically Witcher 3 doesnt run 1080p on Xbox one, not if its 900p 90%+ of the time.

Woah CD Project are such a bunch of liars latetley