Porsche Panamera & GT Coupe: Spy shots?

The testing of the Porsche's have been quite 'odd.' We first reported that the Panamera was being tested using a BMW M5 body, now Winding Road are saying that this 928 is a secret new model called the GT Coupe under disguise. Confused... so are we! Anyway, here are some renderings of how the 4 door Panamera and GT Coupe could look like.

Believe it or not, our sources tell WINDING ROAD that these two are kin. Oh, the intrigue, children.
It’s understood that Porsche is poised for a model lineup expansion frenzy. With the paint on the first batch of Caymans barely dry, plans are afoot for the much-anticipated four-door Panamera (expected late 2009), along with a Bugatti-chasing Carrera GT successor.

But our spies report that an all-new fifth model line is expected to debut in 2010 - a front-engined, two-to-2+2 seating GT Coupe in the mold of the 928, and that the above mule is its primitive forebearer. The business case for a GT coupe makes complete sense, with the market for high-end grand tourers having grown markedly since the 928 fell from Porsche’s catalogs. The market has seen the arrival of everything from Ferrari’s 599 GTB to Bentley’s Continental GT and the entire Aston Martin range, and Porsche is understandibly keen to get in on the action.