This is already a bit older, but I'm still amazed of how much is possible when using one of the state of the art engines (and lots of custom code, I suppose). But this is certainly nice eye-candy. Hopefully, the story and writing of the game will hold up the mark set by The Witcher 3.

The Witcher 4 - Gameplay UE 5.6 Tech Demo | State of Unreal 2025 - YouTube