UPDATE 2016-10-27: the preview is available as a VM in the Azure Marketplace. More information can be found on the SSRS Team blog. You can also find my first impressions of the preview in the blog post First thoughts on Power BI on premises.
UPDATE 2017-05-08: you can find more information about the Power BI on premises options in the blog post Power BI Announcements Summary.
At Microsoft Ignite, it’s announced that very soon, we will be able to host Power BI Desktop files on premises using Reporting Services.
Watch the following Ignite session at the 40:52 time mark:
I’d like to see some demos soon. Anyway, happy dance!
You can see a demo by Riccardo Mutti here:
A preview will be released on Thursday 27 October 2016. It’s an Azure VM where you can try out the Power BI on premises feature.