And the online documentation for the API is here:
Interestingly, the new API seems to be OData compliant – which means you can browse it in Power BI/Get&Transform/Power Query and build your own reports from it. For example in Power BI Desktop I can browse the API of the SSRS instance installed on my local machine by entering the following URL:
This is something that SSRS has been missing for a long time. I’m glad they’re introducing a real API.