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Microsoft's Q&A natural-language search technology is one of the new additions to its Power BI for Office 365 preview

From All About Microsoft:
Power BI for Office 365 allows users with data analysis and visualization capabilities to get deeper insights from their on-premises and cloud data, as Microsoft described the technology earlier this year. Microsoft officials demonstrated Power BI at the company's Worldwide Partner Conference in Houston in July, highlighting the natural-language search capability in Power BI.

It turns out that the natural-language search technology, codenamed "InfoNav," wasn't actually in the public preview that Microsoft delivered this past summer. That technology is only being added to the public preview today, according to the Softies.
  Microsoft adds natural language search to its Power BI preview