I believe this genre of music was classified as soulless pop dance music or the like and while it may have been short lived during the 80s, there's a peculiar appreciation for it nowadays by the youths. It ties into raves, festivals, dance music, edm, it's like the birthing point for most of this.
Take for example this song right here, brand ****ing new, and sounds like it came straight from the 80s.
I should mention though, I am actually a fan of it all. Lol.
http://www.youtube.com/watch?v=_mTRvJ9fugM
So as far as the whole when the foxbody was popular, you gotta try and think less like a mustang owner and more like an ad developer, if anything they probably didn't even consider the popularity of the mustang at the time and are treating the new mustang as an entirely new platform to be introduced. Sure they throw us car people a bone every now and then, but that's not where the money is at.
The car is meant to be youthful and meant for younger people rather than the reminiscent memory of the older style mustang (like the 05-13) which I am a fan of, but I'm just stating this is why it is what it is.