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Autoweek's Editors' Choice from the 2012 Paris motor show

Supercars lit up the City of Light as horsepower and performance took center stage at the 2012 Paris motor show, even as Europe's economic woes cast a dark shadow over the proceedings. Traditionally one of the most dazzling events on the automotive calendar, the show delivered again this year with extravagant reveals. While emissions and fuel economy remain crucial issues, the spotlight Paris debuts subscribed to a higher creed of performance.

The BMW M5 is back!

BMW's M division has gone back to the drawing board with the M5, giving the fifth generation of the iconic four-door a twin-turbocharged 4.4-liter V8 engine—the first time Munich's class-defining performance sedan has gone without a naturally aspirated powerplant since its introduction in 1984. Further changes see it adopt a dual-clutch gearbox as part of a complete driveline rethink that resigns the old model's sequential manual transmission to the history books. Revealed here officially for the first time, the new M5 is planned to make its world debut in concept-car guise at the Shanghai motor show later this month.

Spied: Cadillac ATS-V and a production 2013 Cadillac ATS on the road

Autoweek reader Christina McNeal shot these photos of a 2013 Cadillac ATS out cruising the highways of Michigan. General Motors' BMW 3-series fighter was finished in a metallic dark blue and wore manufacturer plates. According to its badging, it was powered by Cadillac's 3.6-liter six.