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Revolutionizing the BMW M3

BMW is less than a year away from officially revealing the fifth generation of the menacing M3, the first to receive turbocharged six-cylinder power. The performance sedan, code-named F80, is expected to appear as a lightly veiled concept at the 2013 Geneva motor show, debuting the appearance and mechanical package of the M division's eagerly anticipated Mercedes-Benz C63 AMG rival. A showroom-ready version with a production interior arrives at next year's Frankfurt motor show, BMW sources say.

Concept Car of the Week: Oldsmobile Golden Rocket (1956)

From 1949 to 1961, General Motors ran its own motor show. Called Motorama, the annual event was a showcase for concept cars which revealed prospective design and technology directions for all of GM's brands and for cars in general. Each year, one-off creations were designed and built for GM's multiple divisions, from Chevrolet all the way up to Cadillac.

Spied on the street: Porsche Panamera

Yes, Porsche has given up several official photos of the Panamera sedan ahead of the car's expected official rollout at the Shanghai auto show in late April. That means prototypes on the road have stripped off the camouflage. But it's still interesting to see the car in a natural setting.