INTRIGUE surrounds the surprise appearance of a Cadillac CT6 in suburban Melbourne over the weekend, raising speculation that it – or something similar – may eventually replace the Holden Caprice once local carmaking ends in late 2017.

Sent in by eagle-eyed Wheels reader Frank York, the American limousine was snapped with what appears to be emissions-testing equipment attached to the rear underside, suggesting that Holden is at the very least undertaking engineering work on Cadillac’s behalf at Fishermans Bend.

Cadillac -CT6-front -grille
Cadillac -CT6-side -front -parked
Cadillac -CT6-side -on

Unveiled last year as Cadillac’s first full-size rear-drive sedan since the demise of the famous Fleetwood line some 20 years ago, the CT6 has been designed to rival the likes of the Mercedes-Benz S-Class, BMW 7 Series, Audi A8, and Lexus LS in North America, but – similar to the Caprice in Australia – is priced substantially below all of these.

Cadillac -CT6-rear -boot
Cadillac -CT6-rear -exhaust

Expect to see more exotic prototypes in the not-too-distant future, so watch this space…

Have spy pics of your own? We’d love to see them. Just email them to [email protected]