With the addition of Porsche, the Volkswagen Group now has ten brands in its stable. Over the last decade, VW has become pretty adept at sharing platforms and hardware. Porsche and the rest of the group already share an SUV platform between the Cayenne, Touareg and Q7, and the factory-fresh Panamera four-door could be next. VW executives have already indicated that the Panamera is unlikely to live past the first-generation model as a Porsche. That said, like the previous generation Audi A4 that lives on as the Seat Exeo, the Panamera could see new life in the Bentley, Audi, Bugatti or (however unlikely) Lamborghini ranges.
If Bugatti is to survive beyond the Veyron, it needs new product and a sedan based on the Panamera would likely make more sense than the Porsche. Bentley reportedly favors an aluminum Audi platform to replace the steel Phaeton underpinnings of the Continental range, so the winged B may be out of the picture. An Audi is also unlikely for the same reason, since the two-ton Panamera is made of steel. With so many possibilies, it'll be interesting to see how Porsche evolves over the next decade.