The look of the Elmiraj could show up in the new sedan, and a coupe is an option as a variation of the new car, Caldwell said.
The Elmiraj is 205 inches long, about five inches longer than the XTS, which currently is the biggest Cadillac. If the Elmiraj or the sedan go into production, they would be GM's first entry into the large luxury performance car category since the DTS went out of production in 2010.
"It explores performance driving, as well as how we're approaching elevating the Cadillac range," Mark Adams, the brand's design director, said in a statement.
Cadillac said the Elmiraj will take advantage of lightweight metals to cut weight and raise fuel economy. But the car will be powered by a 4.5-liter, twin-turbo V8 that puts out around 500 horsepower.
Inside, the Elmiraj has high-performance seats that are designed to support spirited driving, Cadillac said. The dash has backlit titanium trim with camel leather and wood trim from hand-picked fallen Brazilian rosewood. The car also has a large 10-inch, high-resolution touch screen for navigation and Internet connectivity. The screen can be hidden in the instrument panel when not in use.
The car was designed at GM's studios in North Hollywood, Calif., and built by hand in Michigan. Designers were influenced by the 1967 Cadillac Eldorado two-door luxury coupe, as well as the CTS-V coupe now on the market, Cadillac said.
Caldwell said it's too early to say when or if the Elmiraj would go on sale or how much it would cost. Its Audi and Mercedes competitors start from $75,000 to $90,000.