The following was taken from a Ford site:
There will be no Special Edition Mustangs in 2005; Ford doesn't need the buzz to move them this year. They are considering other special editions in the future, including a Boss, Mach 1, Bullitt, and California Special, though the Bullitt and Mach 1 are less likely because they have already been done recently. There will be no SVT products in 2005. Cobra production is slated to begin in August 2006 as a 2007 model. There will be a Shelby Mustang in the future, but not in 2005.