That looks awesome! The first good rendering of the 15 that I have seen. I don't think its the real one though, I had heard that the 15' tail lights were going to be more "3D" (similar to the 13's only more) and that they were going to layer them to make them sort of overlap.
I would not be surprised if it is the 14' though. I don't know why a computer company would be advertising on a Mustang though. Where did you get this pic?