Porsche has finally confirmed that it will build a fourth model line, to be called Panamera. The Panamera will be a “sport-coupe in the premium class with four seats and four doors”, according to a brief notice. The production vehicle is expected for the 2009 calendar year. The Panamera will be built at the Leipzig factory alongside the Cayenne, and sources are estimating an annual production of nearly 20,000 units. The sleek rear-wheel-drive four-seater will be powered by Porsche’s 4.5-liter V-8 - either the 340-horsepower version, or the optional 450-horsepower turbocharged engine. A hot 500-horsepower version may eventually follow. The new chassis may be shared with Volkswagen in an arrangement similar to the one that spawned the Cayenne.