For Honor will join the growing list of Xbox One X compatible games, as the game got patched last week. You can download the free update right now, and check out the notes below.
Xbox One X graphics are rendered at 4K. This will bring you a much sharper image on a 4K TV. We are using a real-time variable resolution (up to 4K-2160p) coupled with hardware scaling that output to TV resolution. With the scaling, even lower resolution HDTV's will notice a better overall definition.
Improved shadow resolution
Shadows on Xbox One X will have a better definition.
Improved level of detail distances
Far away environment objects will be rendered with a higher definition.
Improved water using Screen-Space Reflections
Many water surfaces will now show dynamic reflections.