The Las Vegas Consumer Electronics Show will today allow General Motors to grab the limelight ahead of this weekend’s Detroit motor show. At the Nevada gadget fest, GM is showing a concept car called the Provoq - a car that takes its American luxury brand Cadillac in two interesting directions - and Autocar can bring you the pictures and details just before the covers come off.The Provoq crossover SUV serves two purposes for Cadillac. Outwardly, it’s a preview for one the firm’s most important new models of 2009, the BRX. This will be GM’s answer to the Audi Q5, Mercedes GLK and Land Rover Freelander, a slightly cheaper and more conventional sub-£30k small 4x4 that will be positioned below the SRX.Aside from this, however, the Provoq is a significant car for GM because it’s powered by the General’s ground-breaking E-Flex powertrain architecture. Underneath this compact 4x4 is a plug-in hydrogen fuel cell powertrain that allows it to cover 20 miles on battery power alone, and a further 280 miles on emissions-free compressed hydrogen gas. This is the first time GM has applied its pioneering plug-in powertrain to one of its premium brand cars, and as such it’s proof of the breadth of GM’s vision for range-extended battery cars. Although we've yet to confirm as much from Cadillac, the Provoq also looks to the be the first E-Flex concept to be based on a different platform than GM's 'Delta' family of mechanicals. Underneath Provoq is the 'Theta' platform, the General's basis for small 4x4s, which proves that the E-Flex system is more adaptable than many first thought.More than anything else though, the Provoq is a bold assertion of confidence from its maker. Within a few years, it seems, not only will GM be making zero-emissions E-Flex cars, but E-Flex cars that are sufficiently capable, well-packaged, stylish and refined to represent its most upmarket brand.