STUTTGART, Germany — Porsche has launched a microsite for its upcoming Panamera. To underscore that this is the company's first four-door sports car, the site carries the tagline: 'The New Panamera. Four, uncompromised.'The site opens with a brief teaser video describing the car's heritage, including footage of current and past Porsches. A sign-up screen after that promises early access to sketches, photos, events, updates and other 'exclusive content.'Porsche is planning a media launch for the Panamera later this fall and will send the first cars to dealerships in Europe and North America in 2009.Inside Line says: You won't see much of the Panamera in the video — but Porsche promises additional Web content soon. — Paul Lienert, Correspondent