When you're as famous as the 2009 Lincoln MKS, sometimes you want to wear a little disguise before you go out. So even though we've seen the MKS live, it doesn't hurt to cover up when heading out among the gentry. That's our theory about what looks to be a pre-production MKS going through testing on California's sunny roads. Of course, it could also be some sort of high performance tester.
If you allow us to speculate even further, this is some kind of test mule for a secretive Lincoln-Mercury product. That would be cool. All things considered, this is likely just a pre-production MKS. Do you, dear readers, have any fun theories? (Thanks to The Mayor for catching this)