one thing that I am missing, is when you are rendering the report that there is an “edit report” button that takes you to Power BI Desktop. A bit like in PowerBI.com, where you can also go to edit mode if you have the correct permissions.
by the way, if you truly want to test it locally, you can download the .vhd file (the virtual hard disk) and run it in your own HyperV environment.
All in all it looks very nice for a first preview. Currently only SSAS is supported and custom visualizations are not, but I guess the SSRS team will surprise us with more features soon. Great job SSRS team!
Lots of interesting thoughts here, so check it out.