GM wants to make the Opel brand a technology leader in Europe, but E-Flex is among the most technologically advanced systems GM has. Offering it in a Chevrolet first runs counter to the plan. GM faces a similar dilemma with the Corvette, which doesn't really fit in with the rest of the Chevy lineup. The Corvette is essentially sold as a stand-alone brand in the rest of the world without referencing Chevrolet. Mike Arcamone, vice president of GM Powertrain Europe, told Automotive News that Opel and Chevrolet would both offer E-Flex vehicles within months of launch, the Opel would likely launch first over there.
Although the Opel Flextreme concept that was shown at Frankfurt last September used a diesel engine for the range-extender, the early production Opels will only use the gas/E85 flex-fuel engine from the Volt. While the Euro-Volt will use the same styling as the American car, the Opel will apparently have a different body style, perhaps more like the Flextreme.
[Source: Automotive News - Sub. req'd]