Are there features in VS2015 that will be needed to run the latest version of oF that arent in VS2013 (or 2012). Not everyone can keep up with the latest VS version unfortunately...
Thinking of C++11 features that wouldn't be fully implemented in older version of VS or third party libraries that would't compile easily...
Edit: and is there a list of the exact version of the libraries being used + eventual homemade patch somewhere ?