The 2015 Cadillac ELR, a luxurious plug-in hybrid based on the Chevy Volt's underpinnings, is set to arrive at U.S. dealers early next year. Photo credit: General Motors Co.

General Motors (GM 1.20%) plans to launch the 2015 Cadillac ELR coupe early next year at a price of almost $76,000. For that price you'd expect the ELR to be a luxurious sports car, but it's not: It's actually a plug-in hybrid, one that GM is already positioning as a rival to Tesla Motors(TSLA 4.96%) electric Model S sedan.

That's an ambitious price and an ambitious target. But there's an interesting twist: The new Cadillac shares its drivetrain with GM's Chevy Volt, a car that can be had for less than half of the ELR's starting price.

What is GM thinking here? In this video, Motley Fool contributor John Rosevear -- who recently had a close look at a pre-production ELR -- shares his impressions of the new Cadillac, and offers some thoughts on what GM's real strategy with the ELR might be.