Back in October, I posted a tweaked rendering of the 2014.5/2015 Mustang (based on one by Josh Byrnes from Carscoops.com) to more accurately represent posts on a Mustang forum from someone who had seen it at an exclusive event. It was posted on Jalopnik here in the thread of everything known so far.
I actually updated that rendering, shortly thereafter, with newer info posted on the thread, but hadn't gotten around to posting a finished version until now.
For better or worse, it's about as accurate as I can get from the feedback. We'll see soon enough.