Fairly certain that eye tracking will be standard on the next generation of VR devices (at least from the major players like the Quest Pro [0] and Pico 4 [1]), which is exciting and terrifying at the same time.

[0] https://www.roadtovr.com/oculus-quest-pro-eye-face-tracking/

[1] https://www.roadtovr.com/pico-4-pro-enterprise-eye-tracking-...