UIElements - Can they be used for in-game UI?

https://github.com/Unity-Technologies/UIElementsExamples
https://docs.google.com/document/d/1ZmtPhJqridaJuzoMJUtBlDq26uHHopdF8M1v6H9McTo/edit#

I just found out about this in 2017.2, and I'm super glad unity is giving us a replacement for IMGUI. This looks awesome

However, I was wondering; can this system be used as in-game UI? I've been trying to figure out how to obtain a "VisualContainer" for the game view in some way but I haven't found anything

 

Hi PhilSA,
this API is currently for the Editor only. We have explored an in-game version. There is no timeline for in-game at this moment, but we are planning for it.
We need to complete the experimental phase at a high level for Editor and than really start again from first principles for in-game requirements.
In the meantime your feedback will be appreciated for the editor work.
Shanti