A cadre of small luxury sedans have emerged as the next big thing in the auto industry.
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Audi's performance-inspired S line enhances already impressive cars.
Recent trademark registrations by Audi may signal upcoming models.
Here's what we know: the 2013 Audi A8 Hybrid, and the extended, limo-like version of the luxury sedan, the A8 L Hybrid, will hit European showrooms in a couple of months.