I've been playing with it lately - I dig it. I was just looking up some World Cup results with it - it's great for filtering and finding "quick and dirty facts" from HTML pages. There's tons of uses (can query Hadoop, JSON, etc).
Anyone else using it?
http://www.microsoft.com/en-us/download/details.aspx?id=39379
Example: install it, open Excel, and flip to the POWER QUERY tab. Tell it to open from web and use this page: http://en.wikipedia.org/wiki/FIFA_World_Cup. Lots of fun things to check out.