One of the most predominant difference between 2012 and 1013 is View Templates. As a new addition to 2013, View Template follow a new workflow - they are LINKED to Views, which keeps all of the Views of the same template consistent in the View Template happens to change. The reason that the V/G settings are grayed-out is because a View Template is currently assigned to that View.
It's a rough transition, but all-in-all I believe that it's an improvement. Solved a lot of our problems, one of which was with users haphazardly changing visibility settings on Views and messing up the Sheets.
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