Aren't they planning to use the platform for the MKS which is larger than the MKZ?
well to use the S550 platform under the MKS it would have to be stretched anyways, besides there's no reason that MKZ and MKS can't ride on the same platform...
Plus the Ford Fusion just started production this August in the Flat Rock plant, where they currently build the Mustang.
The S550 Mustang is expected to be produced at Flat Rock again, but the Detroit News also broke the story that Ford will definitely make the next gen Lincoln MKS at Flat Rock...
So with the MKS moving from the Chicago Assembly plant it should be moving away from sharing with the Taurus and Explorer, all of which are built on the same FWD/AWD platform.
Now we can speculate wildly....
Assuming MKS isn't built on a Fusion platform, its possible they build MKS on the new Mustang platform, making the idea even more palatable the S550 is going to have IRS for the first time ever...
But now where it gets interesting is when we look at Fusion moving to Flat Rock, MKZ and Fusion have always been built side by side so in the big move it is also possible that instead of chopping up fusion demand to build MKZs, they swap the MKZ to the same S550 platform and instantly Lincoln is a real competitor again...
Also worth noting is that the S550 platform is an all new development for Ford so at this point they will be looking to get that platform into as many vehicles as possible to recoup development costs as quickly as possible. I truely believe the S550 platform is a response to Chevys Alpha platform that will underpin the new Camaro and next years CTS and already rides under the ATS...