Visio 2013 provides new features designed to help you create diagrams more intuitively—including new and updated shapes and stencils, improved effects and themes, and a coauthoring feature that makes teamwork easier. You can also make your diagrams more dynamic by linking shapes to real-time data and then share them with others through a browser using Visio Services in SharePoint, even if they don’t have Visio installed. 

Need more information? See the product details page.

Note: This preview software can only be installed on Windows 7 or Windows 8 Release Preview. 

http://technet.microsoft.com/en-US/evalcenter/hh973399