taken from this video, down around the two minute mark. Maybe the best part is that the car's being downsized a bit. I mean, I like the ability to fold up a mountain bike and stuff it in the trunk of my 2012 and all, but a Mustang's really not supposed to be an SUV.
Also, more pics here at mustang6g's forum. For that matter, mustang6g's main page usually has some interesting stuff, including this mildly conjectural rendering:
From the photo of the prototype at the top, this guesstimate looks pretty close. Not sure about that nose yet, but I might be able to get used to it. I prefer the wide-grill look of the 2011-12's (and 1970-73's as well):
but with the right paint scheme the 2015's nose kind of grows on me. Throw in a judicious downsizing to make it into the racy coupe it's supposed to be and Ford will probably have a big winner.