The Short Version
Avatar: Fire and Ash arrives on Vision Pro in 3D, the only headset offering it, despite a Lightstorm Vision deal naming Meta Quest as exclusive mixed-reality hardware.
Avatar: Fire and Ash is on Vision Pro in 3D, which is the only headset where you can watch it that way, despite James Cameron's Lightstorm Vision studio having a separate deal naming Meta Quest as its exclusive mixed-reality hardware partner. Two exclusive deals, two different headsets, one movie. Apple landed the 3D version, and if more titles follow, Vision Pro finally has a content reason to exist beyond tech demos.