apart from the karmann ghia i cant recall vw making sports cars what others were there?, going by recent vw decisions its going to be overpriced in markets it has poor standing in.
last sports car i remember them trying to do ended up with an Lt van engine and they dumped it with porsche as they run out of cash.
cant see it taking off unless they keep the price sensible ie dont try to compete with porsche, audi, bmw, tvr et al. but going by the supercharge, turbo talk it sound like its going to break the bank.