http://www.microsoft.com/en-us/download/details.aspx?id=1335...
page 10 but I'm not sure if it's only about organizations up to 5 but it's fine if you are Individual?? :
"Example 2: A Fortune 500 firm has outsourced the development of its store-locator mobile application to a small agency. The application is not an open source project. The agency has 5 employees working on the project and would like to use Visual Studio Community 2013. Since the agency is a contractor developing this application for the Fortune 500 firm, and since the application is not an open source project, the agency cannot use Visual Studio Community 2013 for developing and testing the application. "
And hard as I tried I couldn't find the details as to what that means without downloading the new version.