The Witcher 4 was developed with customized unreal 5 engine, and this trailer was made with unreal 5 based on the unpublished NVIDIA GeForce RTX graphics card.

Trailer summary: In the trailer, the player sees that Ciri, Geralt's adopted daughter, accepted a witcher commission to go to a remote village. Over years, this village has been attacked by monsters, and the villagers have to offer human sacrifices to calm the monster's anger. In this story, the trailer shows Ciri's brand-new abilities and weapons, including chain weapons and more powerful magic skills.