The Ciel comes with rear suicide doors, and the interior features a smooth wooden dashboard with a simple gauge look. The word "Ciel" is French for "sky"- which is what the designers had in mind when they made the vehicle.
In 2012 and early 2013, Cadillac contemplated developing a production car based on the Ciel. However, in July 2013, they decided not to pursue the venture. 
The Cadillac Ciel was featured in the 2015 movie adaptation of Entourage as a gift from talent agent Ari Gold to the main character Vincent Chase for the success of his directorial debut in the fictional movie, Hyde.