The car itself sounds fantastic car and built under VAG, so methinks like 2ndClass-, an uber-TT is the likely template. VAG is kinda in a bind when it comes to placing new models. The Phaeton proved that; even excellent products need some sort of a defined market segment. Now, a re-skinned TT with Supercar pretensions?
A better Bugatti whould be built off one of the numerous Audi concepts. A V8 or V10-powered car with AWD would make a much better alternative to the Porsche's high-end cars, an entry level Ferrari, or the Gallardo. That would make for a much better placement for an entry level Bugatti.
**VAG marketing, hire me.