Nice to see the interest in the new Exeo on here chaps - if I helps I can clarify a few things about the car.
Yes, it uses the outgoing Audi A4 as its basis, and much of the tooling was transported from Germany to Martorell. Like all SEATs, bar the Alhambra (which is produced in Portugal), the Exeo is built in Spain.
Around 40% of the Exeo is new to the car (ie different to the A4 saloon), most notably the common-rail diesel engines, plus some tweaks to the suspension to make it feel like a SEAT should, different styling front and rear to make it fall into line with the new look established by Luc with the
Ibiza, and a number of other, smaller modifications.
There is a strong business logic behind the car. In order for SEAT to grow and become more profitable, it must not only sell more of the cars it has already, but expand into new market segments. The Exeo's sector (upper medium) may be gradually declining, but it is still one of the very largest segments in Europe - far bigger than the coupe or convertible market, for example. It also means that in Spain especially, customers who have always bought SEAT don't have to leave the brand when they want a car of this type.
By using an existing platform, SEAT has been able to get into this market really quickly with a car that is immediately competitive - and let's face it, the A4 is a fantastic foundation to base the new contender on.
The new car indeed uses the interior of the A4 Cabriolet as its basis, which means incredibly high quality. I've driven some pre-production examples and even those were astonishingly well screwed together. UK cars will be offered stock-full of equipment for great value prices.
Pretty compelling alternative to the usual mainstream stuff in this market segment, I reckon.