While none show the new car in its entirety, the images do show much of the front end, particularly the headlights that feature vertical bars of LEDs that start down low as foglights and continue up to the top of the front fenders. They're similar to the lighting design first shown on the XTS and ATS, except the lower portions are much taller.
There are also views of the rear end and one of the taillights, as well as an interior shot of the front passenger door. The latter image has us most intrigued, as it shows some very high end materials being used in the new CTS interior. The low-gloss wood trim, in particular, looks very premium.
We found these images at GM Inside News, which claimed they surfaced on Cadillac's official Flickr account. We tried to source them there, though GM Inside News provided no link and we couldn't find an official Flickr account for Cadillac (the brand only lists Facebook, Twitter and YouTube accounts on its consumer site).
UPDATE: GM Inside News has pointed out to us the Flickr page they mention in their article, which can viewed here. It's not an official Cadillac account – as we mentioned, there isn't one – so we can't say from where the owner of this private account got the images.