Microsoft is making Power BI  for Office 365 -- the set of services that support sharing and collaboration around data visualizations -- available today. Power BI has some nice sharing and discovery features and combined with newer tools in Excel offers a nice package of business intelligence tools. But it will still require some work to get up and running.
Power BI is really a collection of features, services, and apps designed to help users share data and visualizations. For instance, it lets groups of workers set up SharePoint sites with data visualizations they can share and collaborate on. Users can also create their own individual sites where they can pin reports for easy reference. Users can schedule regular refreshes for the data used in the visualizations too.
The service includes a neat Q&A feature. Using natural language queries, workers can type in a question and the service automatically generates customizable graphs.
In a Power BI trial that Microsoft set up for reporters to use, Microsoft preloaded publicly available data from the World Bank. I searched for "rural population by country" and quickly saw a bar chart showing just that. I was able to change the visualization to a map that displayed different size circles on each country depending on rural population. Clicking the circles showed the data.
Workers can create a query like that and then pin it to a shared Q&A site they use with colleagues.
Microsoft aims to make Power BI available to users on any kind of device, but it's not quite there yet. The Windows 8 app is very, very basic. It lets you view visualizations and update them but that's about it. Microsoft said it's working on a Power BI iPad app.
When viewing Power BI visualizations in a browser, users have the option to switch to HTML5, which theoretically means they can use Power BI on any device. I tried switching to the HTML5 view from the browser on my Windows 8 machine but wasn't ever able to view a visualization in HTML5. In most cases I got an error message.
I found that navigation could use some work. Once I entered the "My Power BI" page, where I could store visualizations for future reference, I couldn't find a way to get back to the shared site. I ultimately went into the admin panel and found it by clicking through a handful of pages.
Overall, the tools that are already available in Excel, like Power Query, Power Pivot, Power View, and Power Map, make for some nice looking visualizations. Power BI lets workers better share and collaborate on those visualizations.
But the stumbling block will be implementation and ease of use. This is not one packaged product that a group or business can buy and start using. To get the full product, businesses need Office 365 and Sharepoint, as well as an administrator to manage it.
All of the new breed of data visualization tools aren't easy to get started using so Microsoft isn't alone in that regard. For instance, Tableau  and ClearStory  take some work and investment to start using while others like BigML  are easy for small groups to get started using. For businesses that are already heavily invested in Microsoft products, Power BI combined with the Power Excel features offer some nice tools that can help workers be smarter about data analysis.