The car is ugly and I don’t know why the focus is on the Hatchback/wagon version. My guess is the back of the sedan is even worse than the hatcback.
Sedan version is there already. Only one pic of it on this site but you missed it. Here it is
http://www.automobilemag.com/auto_shows/2007_new_york/0703_2008_subaru_wrx/photo_08.html
Hard to tell when this picture is small but when you click on it you can see it’s a sedan.
http://www.automobilemag.com/auto_shows/2007_new_york/0703_2008_subaru_wrx/photo_05.html