Porsche has revealed previously undisclosed details of its new Panamera ahead of a planned public debut at next month's Shanghai motor show.

On sale in North America on Oct. 17, the first-ever Porsche sedan will cost more than the BMW M5 and the Mercedes-Benz CLS63 AMG, with prices starting at $89,800 for the base rear-wheel-drive Panamera S and rising to $93,800 for the four-wheel-drive Panamera 4S. Topping the new lineup will be the extensively equipped four-wheel-drive Panamera Turbo, with a $132,600 price tag that will push it into direct competition with the Maserati Quattroporte GTS and the upcoming Aston Martin Rapide.

Styled by a team of in-house designers under the direction of Porsche design boss Michael Mauer, the Panamera is 195.7 inches long, 76.0 inches wide and 55.8 inches tall--making it slightly shorter but wider and lower than the Quattroporte, with which it shares a distinctly coupelike profile. Unlike the Pininfarina-designed Maserati, however, the new Porsche features a large liftback at the rear, enabling easy access to the trunk.