We have got a video demonstration of the new "Moorea" application that will be included with Microsoft Office 15. The application appears to be some sort of aggregator of content, where you'll likely be able to place all information relating to specific topic into the one interface. As Brad Sams says, "Imagine you are doing research on birds; you could have your documents, images, and videos all in one place."
In the video below, Roberto Branni of WinBeta.it demons this new app and how it works. In the video you can again see the hints of the Metro Design Language, as used throughout Windows Phone 7 and possibly to be used in Windows 8, when Branni performs some actions such as saving his tiled content workspace, not to mention the tiles themselves.