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In a surprise move, Honda has unveiled two Civic concepts at the North American International Auto Show.

Designed to preview the 2012 production models, the Sedan and Si Coupe concepts feature steeply raked windscreens, upward sweeping character lines, and 19-inch alloy wheels.

Under the hood, power will be provided by the "widest array of engine choices available in its class." Options will include conventional petrol units, a natural gas variant, and a hybrid. The latter is slated to adopt the newest Integrated Motor Assist (IMA) system which will be powered by a lithium-ion battery - a first for a Honda.

The 2012 Civic will go on sale this summer, so stay tuned for additional details.

Gallery: 2012 Honda Civic Si Coupe and Civic Sedan Concepts debut in Detroit

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