It will be 2014 for the 50th anniversary edition I have a 2004 40th Anniversary Edition GT. I hate to say it but I'd wait it out and get the 50th a much better collectible in my mind than the 2013. Plus there are more enhancements still coming down the lines. I have a cousin who works in the Detroit plant.
I just bought a 2012 V6. It rocks! And I like it better than some of what I'm seeing on the 2013. I fear that the 2014 and 15 is heading into a much higher price point. Unless you have deep pockets buy the 12 now and get it fully loaded.