Has Anyone Figured out the new VR Stereo Layering (not instancing) feature in 4.11 preview 1?

I havent had time to download yet but a quick search on github come’s up with this.

https://github.com/EpicGames/UnrealEngine/search?utf8=%E2%9C%93&q=IStereoLayers

and this

https://github.com/EpicGames/UnrealEngine/search?utf8=%E2%9C%93&q=getlayermanager