Of course, if you read the article the first thought that comes to mind is that it is simply written by another poor journalist.
It looks to me like a four door and a wagon built off the Mustang platform are being considered. I HIGHLY doubt they would be called a Mustang. The Mustang platform is a RWD variant of the C1 platform, which is currently the basis for the Mazda3, European Ford Focus, Volvo S40, V50, C70, and the Mazda 5.
So you could also think of it as a RWD version of a Mazda3 or Ford Focus. Makes the 4-door and wagon ideas seem a lot less threatening.
Now, if you think 4 door like the "4" door Mazda RX-8, that setup you might see on a Mustang...
Yes, except that I don't have 100% faith that Ford won't be dumb enough than to market it as a Mustang for the family set. Honestly.