Actually, no. At least, not
Actually, no. At least, not yet. April 17th will mark 50 years, so whatever is in production at that time might be considered the 50th model year... Maybe? The first Mustang was not a 1964 model. It was officially a 1964 and 1/2 and began production in April. The first 2014's were produced in 2013.
There was talk that Ford might actually make a limited number (500) of a "2014 and 1/2" model, which would be based on the 2015.