Here's what it will look like:
This is unlikely to be the new "Mustang GT" however, it is likely to be either the new Shelby GT500 or the Boss 302. They are not going to put hood vents on a regular GT. I would put my money on this being the new 302, as the lower grille is similar in size to the 302 lower grille and I don't imagine they would put a smaller grille on the "king of the hill" GT500.