Along with Delve I think Power BI is going to be one of the most influential applications in Office 365. The good news is that Microsoft just announced the new Power BI, which has been in preview for a while now, will become generally available on July 24th 2015. You can read more about the release here:
The above video gives a quick overview of what Power BI can do and how it can be used in a business. Best of all, the basic version of Power BI is free!
The next piece of the puzzle after this will be the Office 365 content packs that allow you to surface all sorts of Office 365 analytics directly into Power BI and create amazing dashboards. Can’t wait!