I analyzed the GTA VI trailer with my game engine eyes. 👀
It's making heavy use of motion blur. There are no reflections of off-screen dynamic objects, which hints towards conventional screen space reflections instead of ray tracing. In the first scene, I could identify an artifact (see white circle) almost certainly coming from temporal anti-aliasing, which confirms the footage has been rendered with real-time methods. (not neccessarily in real time)
I also think some effects have been added during post production, which wouldn't surprise me. Furthermore, I believe the look of the motion blur effect is typical for real-time rendering, although I have never implemented motion blur, so I'm not sure what to look for.
What's impressive to me is the overall absence of artifacts. TAA is normally very noticeable, but it could be concealed by the motion blur, which is often done on purpose.
There is one scene where multiple wired fences overlap each other, where TAA would often show difficulties. Unfortunately, the video compression makes it impossible to really judge this shot.
The mirrors in the car scene at 1:01 show clear TAA artifacts due to the missing depth information. I can also see some lens flares which I assume have been added during video editing, they look very out of place.
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