Finally the public will find out what makes the ELR tick, as General Motors said today that the production-intent version of the Cadillac ELR will be unveiled on January 15th in Detroit at the 2013 North American International Auto Show.  This is the same venue the car's parent concept, the Cadillac Converj, first appeared at in 2009.

Cadillac ELR Concept Shown Earlier

Cadillac ELR Concept Shown Earlier

The Cadillac ELR will be functionally similar to the plug-in extended range Chevrolet Volt, utilitizing the same Delta II platform and powertrain, but as Mark Ruess (GM North America President) explains, it will use the battery "quite differently" and the performance "will be quite different from the Volt."

In other words, it is going to be faster. 

GM press release:

On January 15 at the North American International Auto Show in Detroit, we will unveil the all-new ELR. Its confidently sculpted lines are as dramatic as the technology they conceal—a state-of-the-art electric propulsion system featuring a range-extending, gas-powered generator. One look at the ELR, and you'll realize that it's as much a powerful statement as it is a statement about power.

It is expected that both the performance and range specifications of the ELR will be presented at the same time as the car on the 15th.  Both pieces of information have been a well kept secret by GM, as many clues as to the mid-generational update on the Chevrolet Volt are contained inside the ELR.

Production of the car will begin in the summer of 2013, with the first production vehicle being put on public display August 18th, 2013 at Pebble Beach during the Concours d’Elegance.  The car is expected to go on sale to the public in late fall of the same year.

The ELR often has been seen testing ever since GM's Hamtramck facility created two, very close to production-intent, mules over the summer.  The below video shows the ELR (along with a Chevy Volt) road testing in Death Valley (video via Edmunds InsideLine)

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