"2013 Impala—The next large Chevy sedan will be based on the same architecture as the new Cadillac XTS. I've created a Chevy version of that car, and I'm guessing it's pretty close to the real deal. I've used classic Impala logos and wheels, as well as very 1961-like Chevy lettering on the hood. Compared with the XTS, I've simplified the bodysides and given it a late-model Impala greenhouse, as well as smoothing out the trunk shape."
Source (via www.woodyscarsite.com);
http://artandcolourcars.blogspot.com/2011/12/2013-chevrolet-impala-sedan.html