Batman: Arkham Knight is currently running at 900P and 30FPS on Xbox One, and the game hasn't released any enhancement patches since the release of the new console, Xbox Series S/X. Considering that the series spin-off "Gotham Knight" is currently in the intensive development stage, it may not be officially freed. However, according to the latest revelations, "Arkham Knight" may launch an enhanced patch for XSX/S.
In the UI update blog released by Microsoft, foreign media found the icon of "Batman: Arkham Knight". As shown above, you can see that there is an Xbox Series X/S enhancement logo below the icon. If you log in to your Xbox now, then you'll find that it's no longer there. This could be a Microsoft "blunder."
Currently, developer Rocksteady is busy working on their new book, Suicide Squad: Kill Justice League, scheduled for release in 2022 and available on PC, PS5 and Xbox Series X.