David has summarized the articles on Dynamics GP 2013 New Features, which were published this week, in one place...
Take a look at these articles from the link below.
http://blogs.msdn.com/b/developingfordynamicsgp/archive/2012/08/10/microsoft-dynamics-gp-2013-feature-of-the-day-week-3.aspx
Keep watching for more of these articles in the following days!