GMInsideNews has posted spy shots of a refreshed XTS undergoing testing.
From their photos, we can see that significant changes to the front and rear ends are coming. GMI points out the trunk lid seems extend further aft and the grill appears to adopt a look like the recent XT5 crossover.
However, they seem to have missed a key change present in the, albeit blurry, front quarter view.
This appears to be the first Cadillac that will take inspiration from the Escala Concept. As you can see here, the vertical headlight arrangement is replaced with a thin, horizontal headlight very similar to the Escala. It remains to be seen if this new front end will work well with the existing XTS sheet metal. We are a bit nervous how the two themes will work together.