Unless you're a dedicated Mustang fan, you could easily miss this one, but our camera-equipped man on the ground did notice Ford's very lightly camouflaged prototype and took these shots. If you're asking us what it is, we believe it could be the long-rumored Mustang 50th Anniversary Edition, which may use a 2014 1/2 model year badge as a nod to the original pony car instead of the 2015MY moniker.

Obviously, it's a 5.0-liter V8 model, but unlike the new Mustangs we've seen so far, there are no GT badges, while also sporting some minor cosmetic differences, mainly the new grille that does away with the plastic fangs, gaining a more retro style look with an enclosed pony badge.

Furthermore, the covered rear quarter-window seems to be hiding 1960s style louvers, while we also noticed the Brembo brakes hiding behind the black-colored wheels of this tester.

There could be more changes in store, such as a different panel between the tail lights and perhaps, bespoke interior trimmings and mechanical upgrades, but this is pure speculation for now.

We also don't know if this will be a separate special edition or an optional package offered for a limited time, and whether it will be available with the V6 and the 4-cylinder turbo engines as well, but with the New York Auto Show coming up soon, it shouldn't be long before we find out.

Goes on sale later this year

Ford is gearing up for the launch of the 2015 Mustang by releasing new details about the car's aerodynamic styling.

Faced with the challenge of creating an aerodynamic car that embraces the Mustang's history, designers settled on a "sleek, modern and muscular interpretation of the iconic pony car."

In order to reduce drag, the 2015 Mustang is Ford's first model to feature "wheel aero curtains" that channel air from the front of the car to openings in the wheel wells. The air is then directed across the outer surface of the wheels and tires.

Besides the aero curtains, designers created three different grilles that correspond to the three engines that are available on the Mustang. The most notable is the grille on models with the 2.3-liter EcoBoost four-cylinder engine as it features active shutters to reduce drag.

The range-topping Mustang GT also has aerodynamic styling tweaks including a ventilated hood which not only improves engine cooling but helps to keep the front end planted at speed. As Ford explains, "The force required to slice through the air goesup exponentially with the speed, so twice the speed requires eight times the horsepower just to overcome drag."