I can't say much about the Untitled Darth Vader Experience but I've been involved with it from the very beginning and I did all of the lighting and effects work for the teaser, which was revealed at Star Wars Celebration Europe 2016. 

The same scene from the teaser was subsequently modified by Epic Games to showcase Unreal 4's VR Mode running on Apple's Metal 2 and new VR-ready iMacs during WWDC 2017.

Stay tuned to www.starwars.com for future news on this project.

Teaser reveal at Star Wars Celebration Europe 2016.

Unreal 4 demo at WWDC 2017.