Looks like GM have a Concept RWD large Saloon/Sedan built by Opel.
They say it will form the basis of a new GM world platform for large saloon/sedans. The interview also said if it goes ahead, it will all be assembled on Trollhatten, and Saab will use it.
Looks like Saabs as we know them may really be gone soon (but that doesn't mean new RWD Saabs won't be the Best of GM bunch for safety and performance and handling still, the world over).