Python Plugin/EMS system

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Recently, DOE has released EnergyPlus version 9.3 with one remarkable new features:

"a Python Plugin/EMS system"

I looked in the E+ documentation, but I couldn't find anything about this new feature. I don't know if its relevant. But it would be helpful to discuss new capabilities that this feature brings to the E+ co-simulation and also address its limitations! Other than how to use it, I wonder that does it facilitates using other python libraries to perform real-time tasks like advanced control strategies and optimizations? Is it just like BCTVB? Is it still under development? ...