Can you embed reports from Power BI Report Server?

Just to be clear, Power BI embedding and embedding reports using Power BI Report Server are completely different technoclogies. The Power BI Service in the cloud provides an API for retreiving embedding reports, dashboards and tiles and for retreive embed tokens. This server-side API is complimented by a client-side JavaScript API that provides developers with rich functionality to create interactive pages with embedded reports which allows users to navigate between report page, set filters and apply bookmarks. None of this functionality is available with Power BI Report Server which has a completely different set of APIs which have been carried over from SQL Server Report Server.

Power BI Report Server just provides a simple iframe approach to embed a report on a web part, This style of embedding is incredibly thin compared to Power BI embedding in the cloud.