They have and are producing more mustangs currently now that the 2015 Saleen Mustang is fully released. The last quarter of 2014 had 0 mustang sales to my knowledge which would explain a decrease in revenue and I believe the 3rd quarter didn't have many either again, because people were waiting on the 2015 Mustang.
There has been picture and video proof of there being several 2015 Saleen mutangs out there which goes along with what I am saying.