The latest video showing Middle-earth: Shadow of War has Talion flying on what appears to be a dragon.
The image comes from a short clip before the grand reveal of gameplay footage this week on March 8th. Although, this could be a cutscene within the game. Middle-earth: Shadow of Mordor did include rideable mounts, but these were limited to ground mounts.
Middle-earth: Shadow of War launches on August 22nd for Xbox One, PS4, and PC. It'll be compatible with Xbox Play Anywhere feature.