Small cars are great, but there are still a lot of people out there who refuse to buy anything smaller than a mid-size, especially in the USA and Canada. To this end, the PhoeniX platform and design language would have to be stretched into an executive sedan. 

The goal here would be to offer intelligent interior design and layout alongsize nimble handling in order to help differentiate the 9-5 from the dominant Mercedes E-Class. Leveraging the, now existing, AWD technology would very much help.