Hi Guys,
I have spoken with Microsoft Support yesterday regarding this and the respond is as per below:
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Hello Pawel,
I have checked the information.
The feature Teamsite Automapping is currently in development phase and has not yet begun rolling out to end users.
As per the Roadmap , it should be out by October CY2018 . However the timeframes might change.
You find the relevant roadmap at https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=%26searchterms=27031
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Hope this will help to others who look for straight answer where we are with it so you can start doing some provisioning.
For me it does basically stop rollout of sharepoint to the group as it have to seamless to the users if you want convince them to use new tools.
Thanks,