First, the Buick Regal has always had a 2dr and 4dr variant, so yes, it would be true to form.
Secondly, as long as they do not call the 4dr version a GN or GNX, I'd be quite okay with this car coming out...
Thirdly, if you can get something similar to this bad boy in a Grand National setup....for less money.. I'd be very happy with it..
