At the release of the OG Crystal, it was promised and also advertised that there will be mixed reality capabilities through a interchangable mixed reality faceplate.
Same has been said for the Super. And we were at the point where there have been pictures of a prototype. However I remember around the launch of the Apple Vision Pro there was a statement that the concept has to be reworked. Since then there was no mentioning of the MR faceplate ever again.