I've heard of OLED screens being installed in tanks on the Joe Rogan podcast awhile back.
The problem with isolation tanks is that they're already pretty well perfected nowadays with proper airflow and temperature controls. Still expensive as the isolating material is cumbersome to ship, we'll probably see more tech gimmicks incorporated in newer models.
I'd love to see AR being used in diving more than it is already but I can't imagine there's much demand for waterproof VR googles outside of academic research unless it becomes a new tech craze.