Tutorial required for Rasa Core 0.11.1 custom actions, online training and NLG

I think such major changes shouod be posted somewhere explicity like here Important Updates. I am now surprised about this change for custom actions? What is the reason for this and what can I do now better maybe?

So online training is also now running as a server too? So you can link it to a GUI. Is there maybe such an interface out there already?