We've enabled a demo site for testing purpose. You can access it at http://alfresco.demo.zaizi.org/share/page/site/semantic/documentlibrary, using the user demo and password demo.
You will access directly to the "Document Library" section of "Semantic Site". When you'll enter into any document details page (this one, for example), you'll see semantic information in second column, under document metadata information. You're able to view the related content with any entity: