Not sure if this functionality is a teaser or what the long-range plan is, but this is one of those cases I wished I'd read the full overview of this functionality before I started development.
I, and my company, were very excited to leverage ArcGIS in Power BI, rather than the standard map visual. After developing and testing and a few ArcGIS visuals in PBI Desktop I was disapointed to find that they are not supported for Power BI publish to the Web, nor Power BI Embeded, and not even Power BI service embedding (PowerBI.com). See this link for the PBI considerations and limitations.
Apparently, we can only render the visuals in PBI Desktop, Service, or Mobile. To say the least this is a real bummer and isn't a feasible solution to deploy to end users.
To the "Powers" that be; we would be willing to pay a reasonable subscription with ESRI to have this fully functional.