The mini-car is most likely a variation on the VW-Up city car platform.
http://www.autoexpress.co.uk/news/autoexpressnews/220260/vw_up.html
To be fair you can lookup a B7 Audi A4 Avant if you want a good idea. I don't see the point of photo-chops like this, they give people a false example of the final version. By naming the thread as SEAT Exeo Sporttourer the issue is compounded further by people thinking it's official.
Do we need another Passat/Superb/A4 from the VAG group?
THE BEST EVER EVER EVER taxi...