Roush has released a teaser image of their upcoming tuning program for the 2015 Ford Mustang.
There isn't much information (or much visibility in the picture) but there is a hashtag: #ROUSHS550. That makes us think that the vehicle will be called the S550.
What we can glean from the teaser photo is that the Roush Mustang will be equipped with a ventilated hood and a large rear spoiler. There is also front fender badging and five-spoke alloy wheels with some big brakes.
That's about it for now though. Hopefully we will get more information soon.